add heroku button

Author: hone

README.md

@@ -1,5 +1,7 @@
 # Ruby WebSockets Chat Demo
 
+[![Deploy](https://www.herokucdn.com/deploy/button.png)](https://heroku.com/deploy)
+
 This is a simple application that serves tasty WebSockets to your users with [faye-websocket](https://github.com/faye/faye-websocket-ruby), [Puma](https://github.com/puma/puma), and [Sinatra](https://github.com/sinatra/sinatra).
 
 Check out the [live demo](http://ruby-websockets-chat.herokuapp.com/) or [read the docs](https://devcenter.heroku.com/articles/ruby-websockets).

app.json

@@ -0,0 +1,9 @@
+{
+  "name": "ruby-websockets-chat-demo",
+  "description": "A template for getting started with the WebSockets on Heroku using Ruby.",
+  "website": "http://github.com/heroku-examples/ruby-websockets-chat-demo",
+  "success_url": "/",
+  "addons": ["rediscloud"],
+  "env": {},
+  "scripts": {}
+}