Update README.md

[mcjill]

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Request to add apitoolkit to dev resources

Pull Request Template

Please ensure all items below are checked before creating a pull request:

• [yes] My changes were made in the resources folder, not in the auto-generated README.md file or db folder
• [yes] My submission is formatted according to the guidelines in the contributing guide
• [yes] My submission is ordered alphabetically based on the resource name
• [yes] My submission has a useful description
• [ yes] I have searched the repository for any relevant issues or pull requests