Add TODO.

client/src/room/map.rs

@@ -233,6 +233,8 @@ impl RoomMap {
     rooms
   }
 
+  // TODO: Move remaining methods to `RoomEntry`.
+
   /// Records that we have now left the given room.
   pub fn leave(&mut self, room_name: &str) -> Result<(), RoomError> {
     let room = self.get_mut_strict(room_name)?;