Add May Newsletter

[tuhaihe]

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Change logs

Add May Newsletter.

Contributor's checklist

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• Make sure that your Pull Request has a clear title and commit message. You can take the Git commit template as a reference.
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• Learn the code contribution and doc contribution guides for better collaboration.
• Make sure that your changes deployment preview is successful.
• List your communications in the GitHub Issues or Discussions (if has or needed).
• Feel free to ask for the @cloudberrydb/doc team or other people to help review and approve.

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