Create README.md

Author: TheKitty

Circuit_Playground_Express_USB_MIDI/README.md

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+## Circuit Playground Express USB MIDI Controller
+
+CircuitPython code for the ADafruit tutorial https://learn.adafruit.com/cpx-midi-controller/
+
+MIT License, Adafruit Industries
+
+Please use the GitHub Issues/Pull Request mechanisms for issues/revisions
+
+Adafruit puts it resources into building open source hardware and software, 
+please buy products from Adafruit https://www.adafruit.com/