Add docs for releasing arena

ChenYi015 commented 3 days ago

Purpose of this PR

Proposed changes:

Add docs for releasing arena
Add release version badge to README.md

Change Category

[ ] Bugfix (non-breaking change which fixes an issue)
[ ] Feature (non-breaking change which adds functionality)
[ ] Breaking change (fix or feature that could affect existing functionality)
[x] Documentation update

Rationale

google-oss-prow[bot] commented 3 days ago

[APPROVALNOTIFIER] This PR is NOT APPROVED

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Needs approval from an approver in each of these files: - **[OWNERS](https://github.com/kubeflow/arena/blob/master/OWNERS)** Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

ChenYi015 commented 3 days ago

/assign @cheyang

kubeflow / arena