doc UPDATE information about branches

README.md

@@ -18,6 +18,16 @@ Monitoring and Configuration](https://www.liberouter.org/) department of
 [CESNET](http://www.ces.net/). Any feedback, testing or feature requests are welcome.
 Please contact us via the [issue tracker](https://github.com/CESNET/Netopeer2/issues).
 
+## Branches
+
+The project uses 2 main branches `master` and `devel-server`. Other branches should not be cloned. In `master` there are files of the
+last official *release*. Any latest improvements and changes (of the server), which were tested at least briefly are found
+in `devel-server`. On every new *release*, `devel-server` is merged into `master`.
+
+This means that when only stable official releases are to be used, either `master` can be used or specific *releases* downloaded.
+If all the latest bugfixes should be applied, `devel-server` branch is the  one to be used. Note that whenever **a new issue is created**
+and it occurs on the `master` branch, the **first response will likely be** to use `devel-server` before any further provided support.
+
 ## Components
 - **CLI** - simple command line interface to connect to a NETCONF server (device).
 - **server** - NETCONF server with a modular datastore allowing interconnection and control of