doc - Add contributing information

CONTRIBUTING.rst

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+Contributing
+============
+
+First of all, thank you for your interest in contributing to this project!
+
+
+Filing bug reports
+------------------
+
+Bug reports are very welcome.
+Please file them on the `GitHub issue tracker`_.
+Good bug reports come with extensive descriptions of the error and how to reproduce it.
+Try to use the provided issue template, it should be displayed by the GitHub website when creating a new issue.
+
+
+Patches
+-------
+
+All patches should be submitted in the form of pull requests to the main repository, `DinoTools/python-ssdeep`_.
+These pull requests should satisfy the following properties:
+
+Code
+^^^^
+
+- A pull request should focus on **one** particular improvement or change.
+- Create different pull requests for unrelated features or bugfixes.
+- Python code should follow `PEP 8`_, especially in the "do what code around you does" sense.
+- Add test if possible
+
+
+Documentation
+^^^^^^^^^^^^^
+
+When introducing new functionality, please remember to write documentation.
+
+
+Review
+------
+
+Finally, pull requests must be reviewed before merging.
+Everyone can perform reviews; this is a very valuable way to contribute, and is highly encouraged.
+
+
+.. _GitHub issue tracker: https://github.com/DinoTools/python-ssdeep/issues
+.. _DinoTools/python-ssdeep: https://github.com/DinoTools/python-ssdeep
+.. _PEP 8: https://www.python.org/dev/peps/pep-0008/