readme update

zenoh-ts/examples/chat/README.md

@@ -16,6 +16,8 @@ To start the example follow these steps:
    yarn start
    ```
 
+4. Open second browser window on the same address, connect to server and test the chat
+
 The example uses "importmap" approach to run the project. This means that the javascript code
 is loaded by browser directly, without additional bundling. This is done purposedly to
 verify that the zenoh-ts library is ready to be used in browser without additional tooling.