Added 'getQueueLength' to room

ModuleServerAPIGameLibRoom.md

@@ -26,6 +26,16 @@ Clear the queue.
 Room.clearQueue();
 ```
 
+### getQueueLength
+
+Get the amount of players in the waiting queue.
+
+```javascript
+Room.getQueueLength();
+```
+
+**Return** number _Amount of players in the queue._
+
 ## Events
 
 ### on: playerJoinQueue