Create CONTRIBUTING.md (#95)

CONTRIBUTING.md

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+Contributing Guide
+==================
+
+Contributions are welcome! If you would like to help out, here are some suggestions for how to get involved.
+
+## Get involved
+[Watch][watchers] this repository to get notifications about all conversations. GitHub issues and pull requests are the authoritative
+source of truth for design reviews, release schedules, and bug fixes.
+
+## You don't have to contribute code
+
+There are more ways to help that don't involve writing code.
+
+* Respond to new issues. Users often open an issue to ask a question. You are welcome to offer your answer on the thread.
+* :+1: Up vote features that you think are important.
+* Look through issues labeled [closed-stale][closed-stale] to see if there are feature requests worth reviving.
+* Review pull requests.
+
+## Contributing code
+
+* Open issues labeled ["help wanted"][help-wanted] are issues that I think are worth doing, but no one has volunteered to do the work yet.
+  Make a comment on issues you want assigned to yourself.
+* Pull requests are more likely to be accepted if I have first agreed to accept a feature or bug fix. Open an issue first if you aren't sure.
+
+## Questions?
+
+Open a GitHub issue if you'd like to help and don't know where to begin.
+
+[watchers]: https://github.com/natemcmaster/DotNetCorePlugins/watchers
+[closed-stale]: https://github.com/natemcmaster/DotNetCorePlugins/labels/closed-stale
+[help-wanted]: https://github.com/natemcmaster/DotNetCorePlugins/labels/help%20wanted