Add cubic resource

[pomarie]

Summary

• add cubic (AI code reviewer) to resources/c.ts with description, categories, and keywords

Checklist

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

[github-actions]

New resource link: https://cubic.dev/