Add notes on new branches

README.md

@@ -6,6 +6,13 @@
 
 Admin UI for pleroma instance owners.
 
+### Branches
+
+There are two main branches here:
+
+- `develop`: ongoing work and all merge requests go here, *unstable*
+- `master`: after `develop` is stabilized it is merged to `master`, `master` is *stable*, allegedly
+
 ### Features
 
 1. User administration: grant roles to users (admin/moderator), deactivate/delete as well as force their statuses to have NSFW tag, strip media and many more