Create a doc describing release process

[nilekhc]

Similar to - https://github.com/kubernetes-sigs/secrets-store-csi-driver/blob/main/docs/RELEASE.md

[nilekhc]

/kind documentation

[nilekhc]

/good-first-issue

[k8s-ci-robot]

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[yoyounik]

/assign

[yoyounik]

/unassign

[yoyounik]

/assign

[yoyounik]

Hii @aramase @nilekhc i have raised a PR: #91
Please go throigh it, whenever youu get the time, thanks :)