First draft of CONTRIBUTING file

Closes Issue MDAnalysis#508

package/.github/CONTRIBUTING.md

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+## Contributing to MDAnalysis
+
+Thanks for contributing to MDAnalysis!
+
+#### Reporting issues
+
+If you've found a defect with MDAnalysis we'd love to know so we can fix it.  Please follow the Issue template so we can quickly diagnose the problem, in particular the piece of code that causes the problem.
+
+If your issue isn't a defect with the code and instead you require help using MDAnalysis, drop by the [discussion board](http://help.mdanalysis.org).
+
+#### Contributing code
+
+If you're contributing code, please check out the [Style guide](https://github.com/MDAnalysis/mdanalysis/wiki/Style-Guide).
+
+MDAnalysis devs are most easily reached through the [development board](http://developers.mdanalysis.org).

package/.github/ISSUE_TEMPLATE.md

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+### Expected behaviour
+
+
+### Actual behaviour
+
+
+### Code to reproduce the behaviour
+
+``` python
+import MDAnalysis as mda
+
+u = mda.Universe(top, trj)
+
+....
+
+```
+
+### Currently version of MDAnalysis:
+(run 'python -c "import MDAnalysis as mda; print(mda.__version__)"')

package/.github/PULL_REQUEST_TEMPLATE.md

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+Fixes #
+
+Changes made in this Pull Request:
+ - 
+
+
+PR Checklist
+------------
+ - [ ] Tests?
+ - [ ] Docs?
+ - [ ] CHANGELOG updated?
+ - [ ] Issue raised/referenced?