Create README.md

Author: TheKitty

Pi_Processing_GPIO/README.md

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+## Processing Pi GPIO
+
+Processing 3.0 sketch to demonstrate basic GPIO usage on the Raspberry Pi.
+
+Code for the Adafruit Tutorial Processing on the Raspberry Pi & PiTFT 
+at https://learn.adafruit.com/processing-on-the-raspberry-pi-and-pitft/
+
+This code was formerly at https://github.com/adafruit/Processing_Pi_GPIO - this has now been archived.
+
+If you are looking to make changes/additions, please use the GitHub Issues and Pull Request mechanisms.
+
+All code MIT License, please attribute to Adafruit Industries
+
+Please consider buying your parts at [Adafruit.com](https://www.adafruit.com) to support open source code