Add command to clone a repository with branch checkout

This update includes an example of how to clone a specific branch using `git clone`. It enhances the cheat sheet by providing more practical git use cases.

cheat-sheets/git.md

@@ -3,6 +3,8 @@
 ```bash
 # Clone a repository
 git clone <repository-url>
+# Clone a repository with branch checkout
+git clone  -b branch_name <repository-url>
 
 # Add a remote
 git remote add <name> <url>