* Add "Introduction to Reinforcement Learning"

Add "Introduction to Reinforcement Learning" / David Silver

* Update free-courses-en.md
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* add Deno tutorial

* fix: no-url-trailing-slash

* Added cheat sheet refence to swift and c#

* Modified section from PR feedback

* Added free bash shell in Vietnamese

* Fixed lint

* Update free-programming-books-id.md

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* Update free-programming-books-id.md

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* Added Python Regex Cheatsheet

* Added MySQL cheatsheet

* Added PostgreSQL cheatsheet

* Added SQL heading

* Fixed alphabetical order

* Fixed alphabetial ordering error

* Added Electron.js to free-programming-books-zh

* Rename resource and added provider

* Added Flask Documentation

* Update free-programming-books.md
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* * Updated Django section
- Added link to Django Documentation, version 3.1, in brazilian portuguese

* * Removed version specification in the link and change the suggestion to alphabetical order

* free-programming-cheatsheets.md

I have used both of these links during College and they have saved me from hours of searching for help, just by going too these websites.

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Added MDN Django tutorial:  https://developer.mozilla.org/en-US/docs/Learn/Server-side/Django

* Create CONTRIBUTING-fa_IR.md

* Fix Incorrect number of blank lines

* fix "Marker style should be `*`"

for passing Travis-CI build

* add CONTRIBUTING-fa_IR link

* add CONTRIBUTING-fa_IR link

* add CONTRIBUTING-fa_IR link

* Add beginner youtube tutorial by freecodeCamp

* Add two kotlin courses

* Update format convention - fix author credit

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* Move existing course from android to kotlin section
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* [Introdução a Algoritmos e Programação](http://www.ferrari.pro.br/home/documents/FFerrari-CCechinel-Introducao-a-algoritmos.pdf) - Fabricio Ferrari e Cristian Cechinel (PDF)

* Add DenoJS Beginner Course

Add DenoJS section and a free Deno Beginner Course

* fix the order

* fix CI lint error

* Add author name and email required

* Fix formatting for the required field

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* Apply suggestions from code review
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adding "Programmation en Langage C et Systèmes Informatiques"

* Added js regex cheatsheet

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* Add laravel course from Wahidev Academy

* Added Basic React JS from Wahidev Academy

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

* Add basic react native course from Wahidev Academy in Bahasa

* Add basic react native course from Wahidev Academy in Bahasa Indonesia

* Add react native course based project from Wahidev Academy in bahasa

* Adds The Site Reliability Workbook

* Sorts new book

* Adds back empty line

add elasticsearch course

* added section and a book for blazor

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- Algoritmos e Estruturas de Dados com Java
 - Lab. Java com Testes, JSF e Design Patterns
 - Web ágil com VRaptor, Hibernate e AJAX

* Added PHP programming logic course in PT_BR

* Update free-courses-pt_BR.md

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

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* Adding c++ cource 

* adding course c++ at Stepik

* Fix passing travisci

Add blank line after Index section