* 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
* 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
* Add two machine learning course for persian
* Add two machine learning course for persian
* Add two persian C courses
* Add two persian Laravel courses
* Add two persian Java courses
Co-authored-by: amirmozafari <kavian.amirmozafari@student.sharif.edu>
* Add "Symfony 5: The Fast Track" book (en)
* Add "Symfony 5: The Fast Track" book (es)
* Add "Symfony 5: The Fast Track" book (de)
* Add "Symfony 5: The Fast Track" book (ar)
* Add "Symfony 5: The Fast Track" book (fa)
* Add "Symfony 5: The Fast Track" book (ja)
* Add "Symfony 5: The Fast Track" book (ru)
* Add "Symfony 5: The Fast Track" book (it)
* Add "Symfony 5: The Fast Track" book (nl)
* Add "Symfony 5: The Fast Track" book (pl)
* Add "Symfony 5: The Fast Track" book (pt_BR)
* Add "Symfony 5: The Fast Track" book (ro)
* Add "Symfony 5: The Fast Track" book (zh_CN)
* Add "Symfony 5: The Fast Track" book (fr)
* Remove redundant line breaks
