Create codeql.yml

[timnolte]

All Submissions:

• [ ] Have you followed the plugin Contributing guideline?
• [ ] Does your code follow the WordPress' coding standards?
• [ ] Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changes proposed in this Pull Request:

Closes # .

How to test the changes in this Pull Request:

Other information:

• [ ] Have you added an explanation of what your changes do and why you'd like us to include them?
• [ ] Have you written new tests for your changes, as applicable?
• [ ] Have you successfully run tests with your changes locally?

Changelog entry

Enter a summary of all changes on this Pull Request. This will appear in the changelog if accepted.