add usage section to readme

.npmignore

@@ -0,0 +1 @@
+/.idea

README.md

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 remote-control and monitoring for your nodecopter
 ====
 
-note: the code is a complete mess and will eventually be reworked and documented.
+note: the code is a complete mess and will eventually be reworked and
+documented.
+
+usage
+----
+
+Install the module with `npm install nodecopter-monitor`, then integrate it
+into your project with
+
+    var arDrone = require('ar-drone'),
+        client = arDrone.createClient();
+
+    require('nodecopter-monitor').init(client);
+
+after starting your program you can access the monitoring via `http://localhost:3001/webgl.html`