Project: Update README and add CONTRIBUTING.

Author: microbit-carlos

CONTRIBUTING.md

@@ -0,0 +1,10 @@
+Thanks for looking here! We'd love your help. The micro:bit project is only
+possible through contributions of companies and individuals around the world.
+
+This project is managed on GitHub, and the best way to contribute is to jump in
+and fix/file issues.
+
+https://github.com/microbit-foundation/microbit-universal-hex
+
+If you're interested in working on any of these items, please file an issue
+and mention @microbit-carlos.

README.md

@@ -3,3 +3,16 @@
 [![CircleCI](https://circleci.com/gh/microbit-foundation/microbit-universal-hex.svg?style=svg)](https://circleci.com/gh/microbit-foundation/microbit-universal-hex)
 
 TypeScript/JavaScript library to create micro:bit Universal Hexes.
+
+<img width="50%" alt="microbit-universal-hex logo" src="docs/img/microbit-uh-logo.png">
+
+## Documentation
+
+A raw draft of the docs can be found in
+https://microbit-foundation.github.io/microbit-universal-hex/.
+
+## License
+
+This software is under the MIT open source license.
+
+SPDX-License-Identifier: MIT