1. Run the springboot application (RealtimenotiappApplication.java)
2. Access the admin page (http://localhost:8080/)
3. Access client1 (http://localhost:8080/client1)
4. Access client2 (http://localhost:8080/client2)

This app publishes push notification messages to clients. Use the admin/index page to publish messages directly to clients. Clients will receive it as push notifications (no need of any hard refresh from client side)