Update readme

README.md

@@ -8,17 +8,22 @@
 [coveralls]: https://coveralls.io/r/parroty/mono_timer
 [codeclimate]: https://codeclimate.com/github/parroty/mono_timer
 
-Pomodoro-style 25 minutes timer application with notification feature. It's built with Ruby on Rails.
+Pomodoro-style 25 minutes timer application with notification feature. It's built with Ruby on Rails. It supports e-mail notification through [Mailgun](http://www.mailgun.com/) and push-notification through [Pushover](https://pushover.net/).
 
 The main purpose of the development is learning about Ruby on Rails through actual applications rather than a sample code.
 
+[![screenshot](https://gist.githubusercontent.com/parroty/624e44790cf7e35b22f7/raw/a6c10c8a3ac43b45cdb46eb514fe36126a0c6ba3/mono_timer.png)](https://github.com/parroty/mono_timer)
+
 The wiki page would become the storage for what I learned or struggled.
 - https://github.com/parroty/mono_timer/wiki
 
------
+### Demo Application
+The following has demo application (notification feature is not available).
+- https://mono-timer-sample.herokuapp.com/
+
+### Heroku Deployment
 The following contains setup procedure for deploying the application on heroku.
 - https://github.com/parroty/mono_timer/wiki/Deployments
 
 [![Deploy](https://www.herokucdn.com/deploy/button.png)](https://heroku.com/deploy)
 
-[![screenshot](https://gist.githubusercontent.com/parroty/624e44790cf7e35b22f7/raw/a6c10c8a3ac43b45cdb46eb514fe36126a0c6ba3/mono_timer.png)](https://github.com/parroty/mono_timer)