Adds in Kotlin and Git interactive resources (#5844)

* Add in Kotlin interactive resource

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

* Add in Git interactive resource

Author: kree666

Diff for: more/free-programming-interactive-tutorials-en.md

@@ -126,6 +126,7 @@
 
 * [git-game](https://github.com/git-game/git-game)
 * [git-game-v2](https://github.com/git-game/git-game-v2)
+* [Git Tutorial](https://www.w3schools.com/git/) - W3Schools
 * [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)
@@ -225,6 +226,7 @@
 ### Kotlin
 
 * [Kotlin tutorial](https://kotlinlang.org/docs/tutorials/)
+* [Kotlin Tutorial](https://www.w3schools.com/kotlin/) - W3Schools
 * [Learn Kotlin](https://www.codecademy.com/learn/learn-kotlin) - Galina Podstrechnaya, Alex DiStasi (Codecademy) *(account required)*