feat: add examples directory with usage scripts

- Add basic usage examples (evaluate-popular-repos, create-interactive, evaluate-with-token)
- Add advanced examples (batch-evaluate, compare-repositories, export-results, check-org-repos)
- Add integration examples (GitHub Actions, pre-commit hook, Slack integration)
- Add sample data files and expected results
- Add comprehensive README with usage instructions

Closes #9

Author: Nabilhassan12345