Add instruction to create new branch in contribute guide

The contribute guide has been updated to include an explicit step for creating a new branch for changes. This clarification ensures contributors understand the importance of not making changes directly on the main branch.

site/contribute/index.md

@@ -32,6 +32,7 @@ git checkout master
 # Pull the latest updates
 git pull
 
+# Create a new branch for your changes
 git checkout -b <YOUR-BRANCH-NAME>
 ```