DOC: add CONTRIBUTING.md that will be automatically displayed on github

Rather than reproducing the details of contribution guidelines it points
contributors to the existing documentation.

1 files changed, 22 insertions, 0 deletions

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
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+# Contributing to numpy
+
+## Reporting issues
+
+When reporting issues please include as much detail as possible about your
+operating system, numpy version and python version. Whenever possible, please
+also include a brief code example that demonstrates the problem.
+
+## Contributing code
+
+Thanks for your interest in contributing code to numpy!
+
++ If this is your first time contributing to a project on GitHub, please read
+through our
+[guide to contributing to numpy](http://docs.scipy.org/doc/numpy-dev/dev/index.html)
++ If you have contributed to other projects on GitHub you can go straight to our
+[development workflow](http://docs.scipy.org/doc/numpy-dev/dev/gitwash/development_workflow.html)
+
+Either way, please be sure to follow our
+[convention for commit messages](http://docs.scipy.org/doc/numpy-dev/dev/gitwash/development_workflow.html).
+
+