Add Foobara to data/repositories.toml

[azimux]

The project's issues page is here: https://github.com/foobara/foobara/issues

ℹ️ Repository information

The repository has:

• [x] At least three issues with the good first issue label.
• [x] At least 10 contributors.
• [x] Detailed setup instructions for the project.
• [x] CONTRIBUTING.md
• [x] Actively maintained.