Detect PRs from new contributors

[bgrant0607]

And post useful onboarding information, such as pointers to contributing guidelines, advice about how to get started, how to find similar issues, help-wanted, tec.

[ingvagabund]

Who should fall under "new contributors"? Anyone not in kubernetes organization?

[bgrant0607]

@ingvagabund I was thinking 1st PR. Or maybe 2nd PR.

[foxish]

Do we want to do first/second PR across the entire organization, or per-repository? It could be done through the API using the GitHub stats api, and we could figure out when new folks start contributing.

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