[New] How to Create an OAuth App with the Linode Python API Library (#2264)

* [New] How to Create an OAuth App with the Linode Python API Library

This guide details how to use the Linode Python API Library example code to create an app that deploys a Linode using a stackscript.

* Vale Fixes

* More Vale Fixes

* More Vale Fixes

* Add screenshots

* Tech edit

* Copy edited

Author: andystevensname