Add branch information in main README
Apache Unomi
============
+https://unomi.apache.org
Apache Unomi stores user profile information and is mostly used to provide a backend server for A/B testing and
personalization. To do so it implements the currently under development OASIS Context Server specification.
@@ -29,6 +30,15 @@ License
-------
The source code is available under the Apache License V2
+Branches
+--------
+
+- main (master) branch: is the current development branch and should be considered unstable. At this it might even not
+ compile. It is only recommended for Unomi developers or people looking to contribute on the project.
+- unomi-X.X.X branches : these are the maintenance branches of the stable releases of Apache Unomi and should always
+compile and be stable. These are recommended for users that prefer to work from the source code. Otherwise you can find
+packaged binaries on the [Apache Unomi website](https://unomi.apache.org).
+
Documentation
-------------
You can find all the updated documentation, including building and deployment instructions, on the [Apache Unomi
