Added a README.md to encourage forks and PRs

Author: WeatherGod

README.md

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+* Introduction
+This tutorial is a complete re-imagining of how one should teach users
+the matplotlib library. Hopefully, this tutorial may serve as inspiration
+for future restructuring of the matplotlib documentation. Plus, I have some
+ideas of how to improve this tutorial.
+
+Please fork and contribute back improvements! Feel free to use this tutorial
+for conferences and other opportunities for training.
+
+Cheers!
+