Add contribution guidelines

CONTRIBUTING.md

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+### Contributing To Pyblish Lite
+
+If you would like to contribute code you can do so through GitHub by forking the repository and sending a pull request.
+
+When submitting code, please make every effort to follow existing conventions and style in order to keep the code as readable as possible. Pyblish follows [PEP8](https://www.python.org/dev/peps/pep-0008/) and the [Google Python Style Guide](https://google.github.io/styleguide/pyguide.html). Docstrings are written in the [Google Napoleon format](https://sphinxcontrib-napoleon.readthedocs.io/en/latest/example_google.html).
+
+#### Reporting Bugs
+
+If you report a bug, please ensure to specify the following:
+
+- Description
+- Expected Results
+- Minimal steps to reproduce
+
+#### Requesting or Proposing Features
+
+When specifying a feature, try to format it such that anyone can implement it without necessarily asking you about it.
+
+Include the following:
+
+- Goal
+- Motivation
+- Implementation