Adding CONTRIBUTING file to BF repo

CONTRIBUTING.md

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+# Contributing to Bio-Formats
+
+Guidance for contributing to OME projects in general can be found at
+http://www.openmicroscopy.org/site/support/contributing/
+
+Developer documentation specifically for Bio-Formats is at
+http://www.openmicroscopy.org/site/support/bio-formats/developers/
+
+The README file gives instructions for testing your code before opening a PR,
+please ensure you read these.
+
+## The Quick Version
+
+* Fork the GitHub repository.
+* Create a branch for your work based on the latest `dev_x` e.g. dev_5_0 or
+  `develop` branch.
+* Make your commits, test your changes locally as per the README, and open a
+  PR.
+* Make sure you include details of the problem you are fixing and how to test
+  your changes.
+* We may need you to submit some test data
+  [via our QA system](http://qa.openmicroscopy.org.uk/qa/upload/). If the 
+  files are particularly large (> ~2 GB), contact the
+  [mailing list](http://www.openmicroscopy.org/site/community/mailing-lists)
+  and we will get back to you with secure upload details.
+
+We review all PRs as soon as we are able. Someone will comment whether
+the change is fine as-is or request you make changes before we merge it.
+
+## Contributing to Bio-Formats Documentation
+
+The documentation hosted at
+http://www.openmicroscopy.org/site/support/bio-formats/ is built from the
+`/docs/sphinx/` directory. Contributions are welcome but please follow the
+style guidance from the
+[OME Documentation Repository README](https://github.com/openmicroscopy/ome-documentation/blob/develop/README.rst#conventions-used).
+
+Documentation for new supported formats is auto-generated so it is best to
+contact the [mailing list](http://www.openmicroscopy.org/site/community/mailing-lists)
+before embarking on such a change, or submit your new reader code and let one
+of the main OME team deal with the documentation for you.
+