Cherry picks

[nckturner]

What type of PR is this?

Uncomment only one, leave it on its own line:

/kind documentation

What this PR does / why we need it:
Add documentation on cherry-picks and copy script to this
repository.

Does this PR introduce a user-facing change?:

NONE

[k8s-ci-robot]

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[olemarkus]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: nckturner, olemarkus

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