* add tutorial java and spring framework in Indonesia courses

* add tutorial java and spring framework in Indonesia courses 2.0

* add tutorial java and spring framework in Indonesia courses 3.0

* fix alphabetize java courses

* add react native tutorial

* add author's name for react native course

* add a space line

* Update free-courses-pt_BR.md

* Update free-courses-pt_BR.md

Co-authored-by: NEunbee Kim <ekim105@myseneca.ca>

* [Initiation au PHP](http://framasoft.net/IMG/pdf/initiation_php.pdf) - David Ducrocq (PDF)

* Added assembly books.

* Removed duplicate books.

* Added a book.

* Update free-programming-books.md

* Added GDScript

* Update free-programming-playgrounds.md

* Add TH language books

* Add link on README.md

* Update free-programming-books-de.md

* Update free-programming-books-de.md

Removed the 0

* Update free-programming-books-de.md

* 20201018

* 20201018b

* [C - Programmering](http://synkro.dk/bog/c-programmering.pdf) - Henrik Kressner (PDF)

* [Praktické programování v C++](http://www.uamt.feec.vutbr.cz/~richter/vyuka/XPPC/spolecne/prednes.pdf) (PDF)
* [Think Stats: Pravděpodobnost a statistika pro programátory](http://eknihy.knihovna.cz/kniha/think-stats-pravdepodobnost-a-statistika-pro-programatory) - Allen B. Downey (PDF)

* [Microsoft Technologies 3, including books on Windows Azure, SharePoint, Visual Studio Guide, Windows phone development, ASP.net, etc. collection by Eric Ligman](https://blogs.msdn.microsoft.com/mssmallbiz/2017/07/11/largest-free-microsoft-ebook-giveaway-im-giving-away-millions-of-free-microsoft-ebooks-again-including-windows-10-office-365-office-2016-power-bi-azure-windows-8-1-office-2013-sharepo/)
* [Clever Algorithms](http://www.cleveralgorithms.com/nature-inspired/) - Jason Brownlee
* [CS Unplugged: Computer Science without a computer](http://csunplugged.org/books/)
* [Computer Musings](http://scpd.stanford.edu/knuth/index.jsp) (lectures by Donald Knuth)

* [Princeton Algorithms, Part 2](https://www.coursera.org/course/algs4partII)
* [Machine Learning Mini Bootcamp](https://lambdaschool.com/free-course-machine-learning/)

Links were down as of 10/17/20

* Added Laravel, Bootstrap into free-programming-books-zh.md

* Moved Bootstrap from single resource to HTML/CSS

* Added author to Bootstrap 4

* fix alphabetical ordering problem

* Learn Ruby

Added a Ruby online material for learning

* Formatting updated

I formatted the contribution by fixing the alphabetical order of my Learn Ruby tutorial.

Added in 1 free programming course:
* [Introdução ao Kubernetes no Azure](https://docs.microsoft.com/pt-br/learn/paths/intro-to-kubernetes-on-azure/)

by Dr. Charles Severance (University of Michigan)

Added a new Python programming tutorial

* feat: translate CONTRIBUTING doc into zh-TW version

* feat: add link to other CONTRIBUTING

Added a new Python tutorial

Added a new PHP tutorial

Added a link to HOWTO-hi.md.

Added link to HOWTO-hi.md.

* Add Resource(s) & Books

* Add in-progress indicator
Co-authored-by: NARSAN <arsandev@users.noreply.github.com>

* Added books.

* Added a PDF annotation.

* Removed trailing slash.

* Removed some things because of Travis CI warnings.

* Update free-programming-books-ta.md

* Added construction in process.

* Update free-courses-en.md

* Update free-courses-en.md

* add link Python para Competições de Programação in courses pt_BR

* fix number of blank lines and add pdf indicator

added HOWTO.md in Hindi language

* Added ANSI C books

* Update free-programming-books-bg.md

* Update free-programming-books-bg.md