Add instructions for using branches in README.md

README.md

@@ -31,6 +31,10 @@ The newest production-ready release of this application is hosted by the Eastern
 [Dev Branch Deployment](https://cactus-dev.sifs0003.infs.ch/)
 [Main Branch Deployment](https://cactus.projects-ost.ch/)
 
+### Use of Branches
+
+The main and dev-branches are protected. Create a feature branch and a pull request (into dev) to add changes. The main branch is only to be changed from the dev-branch.
+
 ## Contribution
 
 We appreciate your interest in contributing to our project. There are two mainly focused ways to contribute this project showed in this visualization.