Added Readme.md

+#### express-monitor
+A module based on Socket.io and Chart.js to report realtime server metrics for Express-based node servers.
+
+![Monitoring Page](/out.gif?raw=true "Monitoring Page")
+
+### How to use it (in progress)
+1. Add this as a dependency (will be on NPM soon)
+2. Before any other middleware or router add following line: 
+`app.use(expressMonitor());`
+3. Run server and to go `/status`
+