add a quick usage example to README

README.md

@@ -10,6 +10,45 @@ TestHarness/index.html with a browser that supports WebSockets (such
 as Google Chrome).
 
 
+Usage
+=====
+
+The API is very simple, like the native API. You can only open, close,
+and send messages with CPWebSocket.  When you instantiate CPWebSocket
+you pass in a delegate that implements a few methods.
+
+A short example:
+
+<pre><code>// In a method somewhere
+
+// ...
+var webSocket = [CPWebSocket openWebSocketWithURL: @"ws://localhost:8080" delegate: self]
+// ...
+
+// in the delegate implementation:
+
+- (void)webSocketDidOpen: (CPWebSocket)ws
+{
+    CPLog('web socket open: ' + [ws URL]);
+}
+
+- (void)webSocket: (CPWebSocket)ws didReceiveMessage: (CPString)message
+{
+    CPLog('web socket received message: ' + message);
+}
+
+- (void)webSocketDidClose: (CPWebSocket)ws
+{
+    CPLog('web socket closed');
+}
+
+- (void)webSocketDidReceiveError: (CPWebSocket)ws
+{
+    CPLog('web socket error');
+}
+</code></pre>
+
+
 License
 =======