Update CONTRIBUTING.md to be more friendly
Thanks for the language. Might be some other things there that would be helpful to incorporate.
# Contributing Guidelines
+First: if you're unsure or afraid of anything, just ask or submit the issue or pull request anyway. You won't be yelled at for giving your best effort. The worst that can happen is that you'll be politely asked to change something. We appreciate any sort of contributions, and don't want a wall of rules to get in the way of that.
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+However, for those individuals who want a bit more guidance on the best way to contribute to the project, read on. This document will cover what we're looking for. By addressing all the points we're looking for, it raises the chances we can quickly merge or address your contributions.
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## Sign the CLA
Kubernetes projects require that you sign a Contributor License Agreement (CLA) before we can accept your pull requests.
