Update documentation to include OracleTrack

- Update README.md: Change from 9 to 10 trackers, add OracleTrack to table
- Update docs/index.md: Add OracleTrack to features list
- Update docs/guides/trackers.md: Add OracleTrack section with usage example,
  features, and performance metrics
- Add OracleTrack to tracker selection guide and benchmark table

docs: add project documentation

- README.md: Project overview, features, benchmarks, quick start
- CHANGELOG.md: Version history
- CONTRIBUTING.md: Contribution guidelines
- CODE_OF_CONDUCT.md: Community standards
- SECURITY.md: Security policy

Acknowledges BoxMOT, MOT17, YOLOX, and FastReID