Add some guidelines for contributing

.github/CONTRIBUTING.md

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+# Contributing to Python-valve #####
+
+Thank you for wanting to contribute to Python-valve. Whether you're
+reporting an issue, submitting a pull request or anything else, please
+be aware of this project's [Code of Conduct](../CODE_OF_CONDUCT.md).
+To summarise: *be polite, be respectful, be empathetic*.
+
+Additionally, it is expected that English is used in all issues, pull
+requests, code, commit messages, etc.. If English is not your first
+language, your best effort attempt will be appreciated and treated with
+the necessary patience.
+
+Finally, whether it's a bug report, pull request or a feature requests.
+Please check to make sure that it is not a duplicate of an existing
+discussion. If it is a duplicate, add to the existing discussion instead.
+
+
+## Bug Reports ####
+
+When reporting issues with Python-valve, please follow the template that
+is provided to the best of your ability. Sometimes the scope of the issue
+means that the template isn't entirely relevant. In these cases it's cool
+to ignore the irrelevant parts. :+1:
+
+
+## Pull Requests ####
+
+Always feel free to submit pull requests. When doing so, please include,
+at minimum, a short description of what the pull request is for. If the
+pull request addresses a specific issue, please refer back to that issue.
+However, entirely speculative pull requests are also appreciated.
+
+For more complex pull requests, please be more elaborate in your
+description.
+
+A few criteria must be met before a pull request will be accepted:
+
+- When adding **new code**, it *must* have **accompanying tests**. It
+  *must* also **pass all linting checks**.
+- Ideally **all tests must pass**, on all platforms. It's okay to modify
+  tests. It *might* be okay to skip tests or mark them as failing. If in
+  doubt, mention it in the pull request description or comments.
+- If intentionally making non-backwards compatible, **breaking changes**,
+  you **must include a justification**. Ideally, please also demonstrate
+  that you've thought through the implications.
+- If modifying or adding to the public API, the corresponding
+  **documentation must be updated**.
+
+Everyone deserves credit for their work. Therefore, in addition
+to the above requirements, you may wish to add yourself to the formal
+[list of contributors](../CONTRIBUTORS.md), with a very brief description
+of your contribution(s). This is entirely optional though.
+
+
+## Ideas and Feature Requests ####
+
+It's completely fine to open an issue for ideas and feature requests.
+When creating such issues, please be as descriptive as possible and
+include a concrete use case.
+
+
+## If in doubt ... ####
+
+[Open an issue and ask](https://github.com/serverstf/python-valve/issues/new)!

CONTRIBUTORS.md

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+# Python-valve Contributors ####
+
+- **[Oliver Ainsworth](https://github.com/Holiverh)**
+  - Original author and maintainer.
+
+**[Unabridged list of contributors](
+    https://github.com/serverstf/python-valve/graphs/contributors)**.