add extra link on rooms

README.md

@@ -294,10 +294,12 @@ Since v1.2.3 you can now also join and leave a namespace explicitly using ```Joi
 
 ### Rooms
 
-The Rooms functionality is solely based on server implementation, see Socket.IO api for details: https://socket.io/docs/rooms-and-namespaces/#Rooms
+The Rooms functionality is solely based on server implementation, see Socket.IO api for details: https://socket.io/docs/rooms-and-namespaces/#Rooms.
 
 Generally speaking you can have some kind of event to emit to your server specifying the unreal client wants to join or leave a room and then the server would handle that request for you. If you wanted to emit a message to a specific user in a room you'd need a way to get a list of possible users (e.g. get the list on joining the room or via a callback). Then selecting a user from the list and passing their id along with desired data in an emit call to the server which would forward the data to the user in the room you've joined.
 
+See [this basic tutorial](https://www.tutorialspoint.com/socket.io/socket.io_rooms.htm) for implementing rooms on the server.
+
 ### Complex Connect
 
 You can fill the optional _Query_ and _Headers_ parameters to pass in e.g. your own headers for authentication.