Add gif image with example of use

Author: ivanvs

README.md

@@ -9,6 +9,8 @@
 Simple, self-hosted module based on Socket.io and Chart.js to report realtime
 server metrics for Nest.js based node servers.
 
+<img src="https://imgur.com/a/CSo2z8r" alt="Status monitor page">
+
 ## Demo
 
 Demo can be found [here](https://nest-status-monitor.herokuapp.com/status)