Create README.md for micro:bit CRICKIT tutorial

Added README.md for using micro:bit with CRICKIT in MicroPython.

Author: TheKitty

Crickits/Crickit_microbit_MicroPython/README.md

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+[![Micro:bit CRICKIT](picture.png)](https://learn.adafruit.com/using-micro-bit-and-crickit-with-micropython)
+
+## Using micro:bit and CRICKIT with MicroPython
+
+This code accompanies the [Adafruit Learning System](https://learn.adafruit.com) tutorial **Using micro:bit and CRICKIT with MicroPython**
+https://learn.adafruit.com/using-micro-bit-and-crickit-with-micropython/
+
+**Note this code is written in MicroPython, NOT CircuitPython**, as only MicroPython runs on the first generation micro:bit.
+
+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, Limor Fried
+
+Please consider buying your parts at [Adafruit.com](https://www.adafruit.com) to support open source code