Add powerlevel name to value list

specification/client_server_api.rst

@@ -962,6 +962,14 @@ The keys contained in ``m.room.power_levels`` determine the levels required for
 certain operations such as kicking, banning and sending state events. See
 `m.room.power_levels`_ for more information.
 
+A standard mapping between powerlevel Names and Values has evolved with the following mapping
+- 0   User
+- 50  Moderator
+- 100 Admin
+
+These names are used for convenience and clarity within most User Interfaces
+
+
 Joining rooms
 ~~~~~~~~~~~~~
 Users need to be a member of a room in order to send and receive events in that