docs: add release checklist

[shizhMSFT]

What this PR does / why we need it

Add steps to release a new version.

Which issue(s) this PR resolves / fixes

Resolves #55

Please check the following list

• Does the affected code have corresponding tests, e.g. unit test, E2E test?
• Does this change require a documentation update?
• Does this introduce breaking changes that would require an announcement or bumping the major version?
• Do all new files have an appropriate license header?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (3b888ea) 80.15% compared to head (bb1597d) 80.15%.

❗ Current head bb1597d differs from pull request most recent head 49bed28. Consider uploading reports for the commit 49bed28 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #104   +/-   ##
=======================================
  Coverage   80.15%   80.15%           
=======================================
  Files          30       30           
  Lines         897      897           
  Branches      108      108           
=======================================
  Hits          719      719           
  Misses        124      124           
  Partials       54       54           

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[Wwwsylvia]

LGTM

[FeynmanZhou]

@shizhMSFT A prerequisite might be noted here: Have the permission access of ORAS nuget account