Update README.md

[clarkd]

📋 Summary

Update docs for release.

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🔍 Scope of change

• Documentation only
• Repository metadata or configuration
• CI / automation
• Other (please describe):

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📚 Checklist

• I agree to the Code of Conduct

Summary by CodeRabbit

• Documentation
  • Updated the repository description to include the build-plugin AI skill.
  • Replaced outdated plugin-building guidance with prerequisites, quick-start instructions, workflow expectations, and skill update guidance.
  • Added a video guide link and expanded plugin submission requirements.

[github-actions]

🧩 Plugin PR Summary

ℹ️ No plugins were modified in this PR.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI (base), Organization UI (inherited)

Review profile: ASSERTIVE

Plan: Pro

Run ID: 1cacb0de-22aa-4af0-bfb5-cbb6184c9f86

📥 Commits

Reviewing files that changed from the base of the PR and between 3fa031f and 0e33a65.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

Changes

Plugin documentation

Layer / File(s)	Summary
build-plugin workflow guidance README.md	The README identifies the build-plugin skill and documents prerequisites, startup commands, usage, authentication checkpoints, updates, and the full guide.
Plugin submission checklist README.md	The README adds requirements for plugin layout, assets, documentation, secrets, versioning, ownership, pull requests, and Code of Conduct agreement.

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_{Comment @coderabbitai help to get the list of available commands.}