docs(readme): add Benchmarking to Roadmap

Author: Ang

README.md

@@ -219,6 +219,7 @@ print('\n\n'.join(result['results']))
 ## 🗺️ Roadmap
 
 - **OneCite Skill** — Skill package for AI coding agents (Claude Code, Windsurf, etc.).
+- **Benchmarking** — Public benchmark suite and leaderboard for citation extraction/verification accuracy.
 
 ## 🤝 Contributing