Create README.md

Author: TheKitty

CPX_DAC_Guide/README.md

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+## Adafruit Circuit Playground Express Making oscilloscope images with DACs tutorial code
+
+In this project, the Adafruit Circuit Playground Express is used to create 
+random patterns on oscilloscopes by using the digital to analog converter,
+
+The tutorial is in the Adafruit Learning System at https://learn.adafruit.com/dac-oscilloscope-images/
+
+If you are looking to make changes/additions, please use the GitHub Issues and Pull Request mechanisms on this repo.
+
+All code MIT License, please attribute to Adafruit Industries, author Kevin Walters
+
+Please consider buying your parts at [Adafruit.com](https://www.adafruit.com) to support open source code