Update README.md to include link to the ML

Fix #25

README.md

@@ -3,6 +3,8 @@ vroom
 
 Video conf based on [SimpleWebRTC.js](https://github.com/HenrikJoreteg/SimpleWebRTC)
 
+You can try our demo instance here: https://vroom.im
+
 Check documentation here: https://wikit.firewall-services.com/doku.php/projets/vroom
 
-You can also check the demo here: https://vroom.im
+You can also subscribe to the dev mailing list [here](http://list.vroom.im/mailman/listinfo/vroom-dev)