Add CircuitPython (#1327)

readme.md

@@ -127,6 +127,7 @@
 - [Python](https://github.com/vinta/awesome-python#readme)
 	- [Asyncio](https://github.com/timofurrer/awesome-asyncio#readme) - Asynchronous I/O in Python 3.
 	- [Scientific Audio](https://github.com/faroit/awesome-python-scientific-audio#readme) - Scientific research in audio/music.
+  - [CircuitPython](https://github.com/adafruit/awesome-circuitpython#readme) - A version of Python for microcontrollers.
 - [Rust](https://github.com/rust-unofficial/awesome-rust#readme)
 - [Haskell](https://github.com/krispo/awesome-haskell#readme)
 - [PureScript](https://github.com/passy/awesome-purescript#readme)