Create CONTRIBUTING.md

Author: ssisil

CONTRIBUTING.md

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+# Contributing
+
+Everyone is encouraged to help improve this project.
+
+Please submit pull requests against the **master branch**.
+
+Here are some ways *you* can contribute:
+
+* by using nightly builds and prerelease versions
+* by reporting bugs
+* by suggesting new features
+* by writing or editing documentation
+* by writing specifications
+* by writing code (**no patch is too small**: fix typos, add comments, clean up inconsistent whitespace)
+* by refactoring code
+* by closing [issues](https://github.com/pivotal-cf/cfdev/issues)
+* by reviewing patches
+
+## Submitting an Issue
+
+We use the [GitHub issue tracker](https://github.com/pivotal-cf/cfdev/issues) to track bugs and features.
+Before submitting a bug report or feature request, check to make sure it hasn't already been submitted.
+You can indicate support for an existing issue by voting it up.
+When submitting a bug report, please include a [Gist](http://gist.github.com/) that includes a stack trace and any
+details that may be necessary to reproduce the bug including the CF Dev version.
+
+## Submitting a Pull Request
+
+1. Propose a change by opening an issue.
+2. Fork the project.
+3. Create a topic branch.
+4. Implement your feature or bug fix.
+5. Commit and push your changes.
+6. Submit a pull request.
+
+## Copyright
+
+See [LICENSE](LICENSE) for details.
+Copyright (c) 2018 [Pivotal Software, Inc](http://www.pivotal.io/).