Add instructions for adding new DNS zone

[cblecker]

Documenting the steps I recently took to transfer the etcd.io domain under community automation management

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cblecker

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• ~~dns/OWNERS~~ [cblecker]

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/lifecycle stale

[ameukam]

/remove-lifecycle stale /lgtm /hold

Drop the hold when you are ready.

[upodroid]

/hold cancel