Add Heroku support.

README.md

@@ -25,3 +25,25 @@ Parallel list processing
 ------
 If a list name ends with `=`, the top level of tasks will be treated as parallel `@next_action`s.
 The waterfall processing will be applied the same way as sequential lists - every parent task will be treated as sequential. This can be overridden by appending `=` to the name of the parent task.
+
+Executing NextAction
+====================
+
+You can run NexAction from any system that supports Python, and also deploy to Heroku as a constant running service
+
+Running NextAction
+------------------
+
+NextAction will read your environment to retrieve your Todoist API key, so to run on a Linux/Mac OSX you can use the following commandline
+
+    TODOIST_API_KEY="XYZ" python nextaction.py
+
+Heroku Support
+--------------
+
+[![Deploy](https://www.herokucdn.com/deploy/button.png)](https://heroku.com/deploy)
+
+This package is ready to be pushed to a Heroku instance with minimal configuration values:
+
+* ```TODOIST_API_KEY``` - Your Todoist API Key
+* ```TODOIST_NEXT_ACTION_LABEL``` - The label to use in Todoist for next actions (defaults to next_action)