missing contributing

Author: monkstone

CONTRIBUTING.md

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+## Contributing
+In the spirit of [free software][free-sw], **everyone** is encouraged to help improve this project.
+
+Here are some ways *you* can contribute:
+
+* by reporting bugs or problems [here][]
+* by suggesting/implementing new features ( _export using warbler would be cool_ )
+* by writing or editing documentation ( _expert Windows users could help write install instructions_ )
+* by contributing examples ( _show your creativity, or translate someone elses masterpiece, you could learn a lot_ )
+  to do this, and to get recognized for your contribution:- clone this repo, and submit a pull request
+* by refactoring examples to be more rubyfied
+* by closing [issues][]
+* by proselytizing JRubyArt, we need more champions
+* by supporting [Processing.org][], nothing to do with us but we rely on them
+* by figuring out if we could replace swing with javafx for control_panel etc
+* by testing / contributing to the [development branch][]
+
+## Submitting an Issue
+We use the [GitHub issue tracker][issues] to track bugs and features. Before
+submitting a bug report or feature request, check to make sure it hasn't
+already been submitted. When submitting a bug report, ideally include a [Gist][]
+that includes a stack trace and any details that may be necessary to reproduce
+the bug, including your gem version, Ruby version, and operating system.
+
+## Submitting a Pull Request
+1. [Fork the repository.][fork]
+2. [Submit a pull request.][pr]
+
+[free-sw]: http://www.fsf.org/licensing/essays/free-sw.html
+[here]: https://github.com/ruby-processing/propane/issues
+[issues]: https://github.com/ruby-processing/propane/issues
+[gist]: https://gist.github.com/
+[fork]: http://help.github.com/fork-a-repo/
+[pr]: http://help.github.com/send-pull-requests/
+[processing.org]: http://processing.org/foundation/
+[development branch]: https://github.com/ruby-processing/propane