Update/docs assets

[jeffpaul]

Description of the Change

This PR updates the readme and main PHP file to ensure header fields match WordPress.org standards.

How to test the Change

Changelog Entry

n/a

Credits

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Checklist:

• [x] I agree to follow this project's Code of Conduct.
• [x] I have updated the documentation accordingly.
• [ ] I have added tests to cover my change.
• [ ] All new and existing tests pass.