clarify notifications scope usage by adapters (#2676)

README.md

@@ -376,8 +376,9 @@ The js-controller defines in its io-package the system scope together with all d
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 #### How to define own scopes?
-Each adapter can define its own "scopes" for own notifications with its own categories which then will be available in the system. 
-Please contact the core development group if you plan to add an own scope so that scope names can be checked to stay unique.
+Each adapter can define its own "scopes" for own notifications with its own categories which then will be available in the system.
+You can use the name of your adapter as a scope, e.g. `hm-rpc` to avoid conflicts with other scopes.
+If you plan on using a general purpose scope, please contact the core development group so that scope names can be checked to stay unique.
 The same applies if you see the need to enhance the system scope by additional categories. 
 Let's discuss the requirements that they can also be added officially into upcoming js-controller versions.