Add recipe for Llama Triaging & Reporting Tool

[subramen]

What does this PR do?

Adds a new recipe showcasing how to use Llama for automating data analytics and reporting tasks on an open-source repo.

Before submitting

• [ ] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
• [x] Did you read the contributor guideline, Pull Request section?
• [ ] Was this discussed/approved via a Github issue? Please add a link to it if that's the case.
• [x] Did you make sure to update the documentation with your changes?
• [ ] Did you write any new necessary tests?

Thanks for contributing 🎉!