Adding Release Cycle Documentation

[robscott]

What type of PR is this? /kind documentation

What this PR does / why we need it: This is a follow up from a doc I shared at the community meeting earlier this week. This builds on that by formally adding it to our documentation.

Does this PR introduce a user-facing change?:

NONE

/hold for consensus

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: robscott

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[robscott]

Thanks to everyone for the feedback! Since v1.2 release cycle is already beginning, we're going to go with lazy consensus here and plan on merging in another 24 hours. Please get any additional feedback in before then.

[youngnick]

/unhold /lgtm