* Added PHP programming logic course in PT_BR

* Update free-courses-pt_BR.md

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

* Update free-programming-interactive-tutorials-en.md
Co-authored-by: NSeth <seth@elypia.org>
Co-authored-by: NSeth <seth@elypia.org>

* Adding c++ cource 

* adding course c++ at Stepik

* Fix passing travisci

Add blank line after Index section

* Update free-courses-fa_IR.md

* Add Sokan Academy Courses
* Remove "/" from the end of some links
* Remove an English Course (Exists in "free-courses-en" from the main website)
* Add some courses of Maktabkhooneh

* Update free-courses-fa_IR.md

Fix the incorrect number of blank lines and alphabetical ordering

* Add laravel course from Wahidev Academy

* Added Basic React JS from Wahidev Academy

* [Revised] added Laraver course for beginner from Wahidev Academy

Added free microservices course in free-courses-id.md

* Update mathematica links

Addresses #3672 for wolfram/mathematica link

* update sonatype eclipse book

* update mysql tutorial link

* update ravichaganti powershell book

* update single devops collective book

* fix mysql tutorial formatting

* reorder mysql 8.0 tutorial

* update leanpub requirements

* include devops collective author

Addresses #3189, updates the WIP version of the standard to the C17/C18 draft. I was hesitant about using a web.archive link but it seems widely accepted (see Wikipedia https://en.wikipedia.org/wiki/C18_(C_standard_revision), and ISO-9899.info http://www.iso-9899.info/wiki/The_Standard)

* Add Docker courses from #3856 issue, check_urls=free-courses-en.md

* Reword titles to playlist titles

* Add Turkish free courses

* Add Turkish free courses

* Add Turkish courses to README.md

* Added Blockchain Programming Book

* Added the packt link

* Added a Kotlin Playground

* The Kotlin Playground

* Added a Flutter Playground

* Removed the Leadin Slash

* Added Ruby Playground

* Added a new line at the end of free programming playgrounds

* Fixed the spacing in free-programming-books-fa_IR.md

* Fixed More errors in the above file

* Errors fixed in free-programming-books-fa_IR.md

* Some more changes

* Restored the previous farsi file

* Added an Elm Playground

* adding course java with certificate

* changing lowercase letter on 'youtube'

- Remove repeated Sails.js entry from index;
- Change Assembly position to place in alphabetical order

* Delete dead links

* Add React book in German

* add Author

* Fix linting error
Co-authored-by: NLukas Kleybolte <lukas.kleybolte@hs-augsburg.de>

* Update free-programming-playgrounds.md

* Update free-programming-playgrounds.md

* Update free-courses-en.md

* Update free-courses-en.md
Co-authored-by: NSeth <seth@elypia.org>
Co-authored-by: NSeth <seth@elypia.org>

* add a java programming language book

* add 2 empty lines between a new section

the course is not online any more

* add python di prograte course in bahasa

* add c# course in bahasa

* delete python no playlist course

* fixing index c# in course bahasa

* add solidity course id

* Create HOWTO-fa_IR.md

* add Persian translation link to HOWTO.md

* add Persian translation link to HOWTO-zh.md

* add Persian translation link to HOWTO-zh-TW.md

* add Persian translation link to HOWTO-hi.md

* added a book for graphics programming

* Update free-programming-books.md
Co-authored-by: NSeth <seth@elypia.org>

* Update free-programming-books.md
Co-authored-by: NSeth <seth@elypia.org>
Co-authored-by: NSeth <seth@elypia.org>

* Fix Markdown Link

* Add line breaks Levels Heading

* Add Regular Expressions Cookbook

* Add Ruby book in Tamil language

* Remove old non free book and fix title in Ruby book

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

Added many tutorials by w3schools

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

Corrected alphabetic order.

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

Changed as @SethiPandi requested.

* Update free-programming-interactive-tutorials-en.md
Co-authored-by: NSeth <seth@elypia.org>

* Update free-programming-interactive-tutorials-en.md
Co-authored-by: NSeth <seth@elypia.org>

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

Added 4 interactive courses.

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

Added correct number of newlines

* Update free-programming-interactive-tutorials-en.md
Co-authored-by: NSeth <seth@elypia.org>
Co-authored-by: NSeth <seth@elypia.org>

* Add Persian free courses file

* Add two new C and C++ courses

* Add two new php courses

* Add two new Machine Learning courses

* Add two new Java courses

* Add a Python course

* Add two new Linux courses

* Fix a Python's course link

* Add the author's name

* Convert the author's name to English

* Add Persian courses link

* Fix number of blank and ordering

* Remove course from books file

* Add Laravel section