Add May Newsletter

[tuhaihe]

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Change logs

Add May Newsletter.

Contributor's checklist

Here are some reminders before you submit your pull request:

• Make sure that your Pull Request has a clear title and commit message. You can take the Git commit template as a reference.
• Sign the Contributor License Agreement as prompted for your first-time contribution (One-time setup).
• 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.

[netlify]

✅ Deploy Preview for cloudberrydb ready!

Name	Link
🔨 Latest commit	196937e
🔍 Latest deploy log	https://app.netlify.com/sites/cloudberrydb/deploys/665ef0d94211360008d71a0f
😎 Deploy Preview	https://deploy-preview-132--cloudberrydb.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

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To edit notification comments on pull requests, go to your Netlify site configuration.

[TomShawn]

LGTM