Merge pull request #587 from TechplexEngineer/patch-3

added Learn Git Branching Tutorial

free-programming-interactive-tutorials-en.md

@@ -9,6 +9,7 @@
 
 ###Git
 * [Try Git](http://try.github.io)
+* [Learn Git Branching](http://pcottle.github.io/learnGitBranching/)
 
 
 ###Go