Add git-game and git-game-v2 interactive tutorials (#4536)

free-programming-interactive-tutorials-en.md

@@ -98,6 +98,8 @@
 
 ### Git
 
+* [git-game](https://github.com/git-game/git-game)
+* [git-game-v2](https://github.com/git-game/git-game-v2)
 * [Githug](https://github.com/Gazler/githug) (Tutorial in shell)
 * [Learn Git Branching](https://learngitbranching.js.org)
 * [Learn Git with Bitbucket Cloud](https://www.atlassian.com/git/tutorials/learn-git-with-bitbucket-cloud)