Add Heroku Button

README.md

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+python-sample
+=============
+
+A 'hello world' web app written in Python using the [Flask](http://flask.pocoo.org/) microframework.
+
+[![Deploy](https://www.herokucdn.com/deploy/button.png)](https://heroku.com/deploy)

app.json

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+{
+  "name": "Python Flask sample",
+  "description": "A 'hello world' Python app using the Flask framework",
+  "repository": "https://github.com/heroku/python-sample",
+  "keywords": ["python", "flask"]
+}