* feat(playground): Add regex section

* feat(playgrounds): Add regex101.com by Firas Dib

* feat(playgrounds): Add regexr.com by GSkinner

* feat(playgrounds): Add regextester.com @ Dan Tools

* feat(playgrounds); Add iHateRegex.io by GeonGeorge

RESOURCE:   Financial Numerical Recipes in C++
AUTHOR:        Bernt Arne Ødegaard
URL 1:             http://finance.bi.no/~bernt/gcc_prog/recipes/ 
URL 2:             https://tfetimes.com/wp-content/uploads/2015/04/recipes.pdf
DATE:              Jun 2014
HOME:            https://ba-odegaard.no/gcc_prog/recipes/
PDF:                https://ba-odegaard.no/gcc_prog/recipes/recipes.pdf
PRINT:            https://ba-odegaard.no/gcc_prog/recipes/recipes.ps
SOURCES:      https://ba-odegaard.no/gcc_prog/recipes/finrecipes.zip

Improves EbookFoundation/free-programming-books#6213
Improves EbookFoundation/free-programming-books#5470

* bootstrap 5 tutorials added

* updaded fix

* update with dart sugestion

* Update books/free-programming-books-pt_BR.md
Co-authored-by: NImVector <59611597+LuigiImVector@users.noreply.github.com>

* Update books/free-programming-books-pt_BR.md
Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com>

* Update books/free-programming-books-pt_BR.md
Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com>
Co-authored-by: NImVector <59611597+LuigiImVector@users.noreply.github.com>
Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com>

* Add PyTorch Cheat Sheet

* put lists in order

* fix order

Added Distributed Systems 3rd edition to the Cloud Computing section.

* Fix broken Financial Numerical Recipes in C++ link

* Add pdf label

* feat(books): Add Blockchain subject

Add new section about the `Blockchain` topic.

Suggested at EbookFoundation/free-programming-books#5696, commit https://github.com/EbookFoundation/free-programming-books/pull/5696/commits/69b21f283a0c098a3d871113216eee5ec1d40f8c

* feat(books): Add `Blockchain for Dummies`

Title: Blockchain for Dummies, 2nd IBM Limited Edition
Author: Manav Gupta
Year: 2018
Editorial: IBM
Publisher: John Wiley & Sons, Inc

* feat(books): Starting with Enterprise Blockchain

Title: Getting Started with Enterprise Blockchain. A Guide to Design and Development
Url: https://www.ibm.com/downloads/cas/RYWXAR0M
Authors: Michael Bradley, David Gorman, Matt Lucas, Matthew Golby-Kirk
Editor: IBM Corporation
Publisher: O'Really Media Inc

* feat(books): Add `IBM Blockchain: The Founder’s Handbook`

TITLE:            IBM Blockchain: The Founder’s Handbook (An introduction to building a blockchain solution), Third Edition
AUTHORS:    Antonio Banda, Matthew Hamilton, Eileen Lowry, John Widdifield, Andy Carelli, Jerry Cuomo, Kalie Dove-Maguire, Elaine Lai, Brigid McDermott, Carolyn Rogers, Don Thibeau
DATE:            June 2020
EDITOR:        IBM Corporation
PUBLISHER:  IBM Corporation

* chore(books): Classify other Blockchain resources

Move some resources from `Misc` ... to `Blockchain` section

Some other related topics that can fit:
- Cryptocurrencies
- Hyperledge
- Bitcoin
- Ethereum
- Solidity

* chore(books): CDN 2 website link + all authors

BOOK:           Bitcoin and Cryptocurrency Technologies
AUTHORS:     Arvind Narayanan, Joseph Bonneau, Edward Felten, Andrew Miller, Steven Goldfeder, Jeremy Clark
CDN (draft):   https://d28rh4a8wq0iu5.cloudfront.net/bitcointech/readings/princeton_bitcoin_book.pdf
FRONTEND:   http://bitcoinbook.cs.princeton.edu

* added boostrap5 course

added bootstrap 5 persian taught course to free-courses-fa_IR

* updated url path to playlist 

changed single video url to playlist url

* moved bootstrap to web section

* updated bootstrap5 section

moved from subsection to specific web development section

* Update free-courses-fa_IR.md

* Update free-courses-fa_IR.md

* Update free-courses-fa_IR.md

* Update courses/free-courses-fa_IR.md
Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com>

* Update courses/free-courses-fa_IR.md
Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com>
Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com>

Co-authored-by: NEric Hellman <eric@hellman.net>

Co-authored-by: NEric Hellman <eric@hellman.net>

Improves EbookFoundation/free-programming-books#5273

* Add Element of Data Science

* Fix typo Elements of Data Science

* Flutter bangla course add

add Bangla flutter tutorial course

* updated

* Added Haskell and Prolog books; edited some incorrect Haskell entries

* Added names to Prolog and Haskell books.

* Removed trailing slash

* Update books/free-programming-books-langs.md
Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com>

* HTTP -> HTTPS fix
Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com>

* Updated BeanShell Scripting Language in Books-en

* Added two more resources.

Corrected the order of the heading and added three more resources for the scripting language

* add creator
Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com>

* add creator
Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com>

* Removed blog entries
Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com>

* remove space
Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com>
Co-authored-by: NEric Hellman <eric@hellman.net>
Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com>

Co-authored-by: NBrian Choromanski <Brian.Choromanski@commscope.com>

Co-authored-by: NEmad Ehsanrad <emad.ehsanrad@gmail.com>

* New books on linux added

* New Git course added

* signup required (in Farse) added to the course

* fix linter issue
Co-authored-by: NEmad Ehsanrad <emad.ehsanrad@gmail.com>

* add "easy forth" and "learning apl"

* reorder alphabetically, add authors

* Add a Korean ebook

* Add author of Jump to flask

* Change order

* Change the order

* Change the order

* Change the order

* Added new web development course

* Update free-courses-en.md

* Added new language to "Podcast - Screencast"

* Create free-podcasts-screencasts-si.md

AWK guide subject mistyping as AWS

* Added "A Computational Logic"

Added "A Computational Logic" by Robert S. Boyer and J Strother Moore.

* Added info to "A Computational Logic"

Added the publication year.

Co-authored-by: Nwangxu <wangxu03@megvii-inc.com>

* Add French podcasts

* Fix error in markdown

* Remove trailing slash

* Add blank line between last setion and next heading

* Add blank line between last setion and next heading

* Update README.md

* Add Object-Oriented JavaScript course

* Move entry to correct position

* Update course info
Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com>
Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com>

* docs: arrange course list

* docs: add go course

* fix: order course list according to lint

* fix: rearrange hierarchical structure

* Update free-programming-interactive-tutorials-en.md

* Update free-programming-interactive-tutorials-en.md

* Fix linting errors

* Fix linting errors

* Update more/free-programming-interactive-tutorials-en.md
Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com>

* Update free-programming-interactive-tutorials-en.md

Add another resource and rename the section

* Update free-programming-interactive-tutorials-en.md
Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com>

* Added Blockchain resources to free-courses-en

Added Blockchain resources to free-courses-en

* Update free-courses-en.md

* Added Blockchain resources to free-courses-en

Made changes to the resource(s) about Blockchain in free-courses-en.md

* New changes made to Blockchain resources

added the cryptozombies link which i previously deleted by mistake
changes the Playlist text to YouTube Playlist

* Update courses/free-courses-en.md
Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com>

* Update courses/free-courses-en.md
Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com>

* Update courses/free-courses-en.md
Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com>

* add creator
Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com>
Co-authored-by: NEric Hellman <eric@hellman.net>
Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com>

* add to documentation

* Added RPi cheatsheets

* Update free-programming-cheatsheets.md

* Update free-programming-cheatsheets.md

* Update free-programming-cheatsheets.md

* Update free-programming-cheatsheets.md

* Update free-programming-cheatsheets.md

fixed 404 broken link issue

* Update free-programming-cheatsheets.md

* Update CONTRIBUTING.md

* Added Blockchain books -PDF

* Delete free-programming-books-langs.md

* Re-added books

* Additional changes, mods.

* Update free-programming-books-langs.md

* Modifications contrib.

* Update CONTRIBUTING.md

* Update CONTRIBUTING.md

* Additions for Tensorflow cheatsheets (other branch)

* Update free-programming-cheatsheets.md

* Changes on other files

* Update free-programming-cheatsheets.md

* Additional changes

* Final changes for cheatsheets page nl ends.

* Update free-programming-cheatsheets.md

added the official content from kaggle for TF (includes pdf link, html only)
removed the blog TF link at the top (as per contributing.md guidelines)

* Update free-programming-books-langs.md

About: Blockchain additions, removed all the whitepapers from the list.

Why is the "Introducting Eth*" allowed in the PDF list of ebooks and the "*for dummies" series  not allowed? I do not see that rule in the contributing.md file
AFAIK, both are online ebooks links, both with an ISBN/Table Of Contents for chapters.

Either way, i replaced the first one with one that is free from offic. ibm public link

* delete patch

* Remove patch. not free
Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com>

* use wayback machine to provide its backed PDF link
Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com>

* add in process, creator
Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com>

* blockchain is not a language. the dummies book should be is subjects list
Co-authored-by: Neric <eric@hellman.net>
Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com>

* Added: Free courses and Resource in khmer language.

Added: Free courses and Resource in khmer language.

* Fixed: linter error.

Fixed: linter error.

* Fixed: build error

* Added: khmer language  course to readme. 

Added: khmer language  course to readme.

* Changed: khmer iso code from kh to km

* changed: khmer iso code from kh to km

* Changed content and fix links.

Removed non khmer courses, changed link youtube, and  fix Alphabetized order

* fixed: order alphatically

* fixed: title and content error.

* removed: non khmer courses.

* Add udacity course Offline Web Applications

* Move entry to correct position

* Add author info
Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com>
Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com>