#8 Added marker to indicate read status in talk chats

lib/api/marianumcloud/talk/createRoom/createRoom.dart

@@ -4,13 +4,14 @@ import 'package:http/http.dart';
 
 import '../talkApi.dart';
 import 'createRoomParams.dart';
-class CreateRoom extends TalkApi<void> {
+class CreateRoom extends TalkApi {
   CreateRoomParams params;
 
   CreateRoom(this.params) : super("v4/room", params);
 
   @override
   assemble(String raw) {
+    return null;
   }
 
   @override