Adding a Contributors file (#22)

CONTRIBUTING.md

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+# Contributing to linkerd-tcp #
+
+:balloon: Thank you for using the linkerd-tcp project!
+
+## Getting Help ##
+
+If you have a question about linkerd-tcp or have encountered problems
+using linkerd-tcp, you may [file an issue][issue] or join us on
+[Slack][slack].
+
+## Submitting Changes ##
+
+If you'd like to make a change to linkerd-tcp, you should do the
+following:
+
+1. Submit an [issue][issue] describing your proposed change.
+2. We will respond to your issue promptly.
+3. If your proposed change is accepted, and you haven't already done
+so, sign [Buoyant's Contributor License Agreement][cla].  Before we
+can accept your patches, our lawyers would like to be assured that:
+    - The code you're contributing is yours, and you have the right to
+    license it.
+    - You're granting us a license to distribute said code under the
+    terms of this agreement.
+4. Fork the linkerd-tcp repo, develop and test your code
+changes. See the project's [README](README.md) for further information
+about working in this repository.
+5. Submit a pull request against linkerd-tcp's `master` branch.
+6. Your branch may be merged once all configured checks pass,
+including:
+    - 2 code review approvals, at least 1 of which is from a buoyant member
+    - The branch has passed tests in CI.
+
+### Git history ###
+
+Prior to submitting a pull request, please revise the commit history
+of your branch such that each commit is self-explanatory, even without
+the context of the pull request, and that it compiles & tests
+cleanly.
+
+Typically, a pull request consists of a single commit.  It may
+occasionally be preferable to submit a change with several commits,
+but each should be a complete change needed to complete a larger
+feature.  Each commit should be documented appropriately.
+
+Thank you for getting involved!
+:heart: Team Buoyant
+
+[cla]: https://buoyant.io/cla/
+[issue]: https://github.com/linkerd/linkerd-tcp/issues/new
+[slack]: http://slack.linkerd.io/