Document GitHub moderation policies

[arnab-logs]

This PR adds a github moderation section to document contribution standards and moderation practices for Kubernetes github repo.

@kubernetes/owners would appreciate a review when you have the time. Happy to iterate based on feedback.

Fixes #8439

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[k8s-ci-robot]

Hi @arnab-logs. Thanks for your PR.

I'm waiting for a kubernetes 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.

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[jasonbraganza]

/unassign

will let better, more experienced minds handle this

[Priyankasaggu11929]

cc: @kubernetes/owners for review.

[Priyankasaggu11929]

/ok-to-test

[Priyankasaggu11929]

cc: @BenTheElder