fix: update README

Author: c12simple

README.md

@@ -122,4 +122,10 @@ GitHub Actions use MkDocs and Mike to build the documentation and store the resu
 
 A separate GitHub Pages workflow listens to changes on gh-pages and triggers the website update process.
 
-Live Documentation: https://pydio.github.io/docs
+Live Documentation: https://pydio.github.io/docs
+
+## Adding new branch
+
+When you need a new branch:
+* Chekout new branch from one of document brach
+* Update [main branch] resources/versions.json file