chore: add resource under backend:version-control-systems:git

src/data/roadmaps/backend/content/104-version-control-systems/101-git.md

@@ -7,3 +7,5 @@ Visit the following resources to learn more:
 - [Git & GitHub Crash Course For Beginners](https://www.youtube.com/watch?v=SWYqp7iY_Tc)
 - [Learn Git with Tutorials, News and Tips - Atlassian](https://www.atlassian.com/git)
 - [Git Cheat Sheet](https://cs.fyi/guide/git-cheatsheet)
+- [Learn Git Branching](https://learngitbranching.js.org/)
+- [Git Tutorial](https://www.w3schools.com/git/)