feat: KIND Style Guide

[adambkaplan]

Adding a style guide for contributors. The following text branding for the project is now official:

• kind in backticks
• "KIND" in all uppercase.

Other prior forms, such as "KinD", are no longer allowed.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: adambkaplan
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[k8s-ci-robot]

Hi @adambkaplan. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[stmcginnis]

There are always exceptions, so "discouraged" might be a better choice than "not permitted". But not that critical.

[stmcginnis]

Pointed out one minor nit, but I don't feel strongly about it.

/lgtm
/ok-to-test