Merge pull request #15 from heroku/add-heroku-button

add heroku button

README.md

@@ -4,6 +4,8 @@ A barebones Node.js app using [Express 4](http://expressjs.com/).
 
 This application supports the [Getting Started with Node on Heroku](https://devcenter.heroku.com/articles/getting-started-with-nodejs) article - check it out.
 
+[![Deploy to Heroku](https://www.herokucdn.com/deploy/button.png)](https://heroku.com/deploy)
+
 ## Running Locally
 
 Make sure you have [Node.js](http://nodejs.org/) and the [Heroku Toolbelt](https://toolbelt.heroku.com/) installed.