Add setup.py and distribution basics

CONTRIBUTING.md

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+# Contributing
+
+This module was designed for use in education; particularly for young children. It is not intended to replace `RPi.GPIO` and it does not claim to be suitable for all purposes. It is intended to provide a simple interface to everyday components.
+
+If a proposed change added an advanced feature but made basic usage more complex, it is unlikely to be added.
+
+## Suggestions
+
+Please make suggestions by opening an [issue](https://github.com/RPi-Distro/gpio-zero/issues) explaining your reasoning clearly.
+
+## Bugs
+
+Please submit bug reports by opening an [issue](https://github.com/RPi-Distro/gpio-zero/issues) explaining the problem clearly using code examples.
+
+## Documentation
+
+The documentation source lives in the [docs](https://github.com/RPi-Distro/gpio-zero/tree/master/docs) folder and is rendered from markdown into HTML using [mkdocs](http://www.mkdocs.org/). Contributions to the documentation are welcome but should be easy to read and understand.
+
+## Python
+
+- Python 2/3 compatibility
+- PEP8-compliance (with exceptions)