feat: Add "How to collaborate on Github" (#3416)

* feat: Add "How to collaborate on Github"

* fix: wrong alpha order

free-programming-books.md

@@ -1248,6 +1248,7 @@ Kerridge (PDF) (email address *requested*, not required)
 * [Git Succinctly, Syncfusion](https://www.syncfusion.com/resources/techportal/ebooks/git) (PDF, Kindle) (email address *requested*, not required)
 * [Git Workflows](http://documentup.com/skwp/git-workflows-book)
 * [GitHub Cheat Sheet](https://github.com/tiimgreen/github-cheat-sheet) - Tim Green (Markdown)
+* [How to Collaborate on Github](https://github.com/eonist/How-to-collaborate-on-github) - André J
 * [Intoduction to Git and Github](https://launchschool.com/books/git) - Launch School
 * [Intoduction to Git and Github - Tutorial](http://cse.unl.edu/~cbourke/gitTutorial.pdf) - Dr. Chris Bourke (PDF)
 * [Learn Git - Learn Version Control with Git](http://www.git-tower.com/learn/git/ebook/command-line/introduction) - Tobias Günther