Update README.md

Author: lganzzzo

README.md

@@ -5,6 +5,7 @@ Collection of oatpp WebSocket examples.
 In the box:
 
 - [async-server](https://github.com/oatpp/example-websocket/tree/master/async-server) - Asynchronous WebSocket server example.
+- [async-server-rooms](https://github.com/oatpp/example-websocket/tree/master/async-server-rooms) - Asynchronous Room-Based chat server.
 - [server](https://github.com/oatpp/example-websocket/tree/master/server) - Multithreaded WebSocket server example.
 - [client](https://github.com/oatpp/example-websocket/tree/master/client) - Simple WebSocket client example.
 - [client-binance.com](https://github.com/oatpp/example-websocket/tree/master/client-binance.com) - Example client for reading crypto trading event stream from binance.com.