adding release management documentation for Kmesh

[LiZhenCheng9527]

adding release management documentation for Kmesh

[kmesh-bot]

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[kevin-wangzefeng]

Thanks for initiating this, it looks this PR only defines release process, without the role "release manager" definition mentioned in the PR title?

[LiZhenCheng9527]

Thanks for initiating this, it looks this PR only defines release process, without the role "release manager" definition mentioned in the PR title?

Sorry, my PR description is not accurate. I will make the necessary modifications.