Add README with license + schema metadata

README.md

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+---
+license: cc-by-nc-4.0
+language:
+- en
+- et
+task_categories:
+- visual-question-answering
+- question-answering
+tags:
+- physics
+- olympiad
+- multimodal
+- evaluation
+- audited
+- novel-source
+size_categories:
+- n<1K
+configs:
+- config_name: default
+  data_files: eval_olympiad_v2.jsonl
+---
+
+# eval_olympiad_v2
+
+A 500-problem 99.8%-novel-source open-ended physics olympiad evaluation set, two-stage audited (5-gram Jaccard ≥ 0.4, mxbai-embed-large cosine ≥ 0.85) against PhyX, MMMU-Pro Physics, OlympiadBench-Physics, and UGPhysics-Train.
+
+## Sources
+- **Estonian Physics Olympiad** — with native 1–10 organizer-issued difficulty labels and 201 EN/ET bilingual subset
+- **Kevin Zhou's olympiad handouts** — with native 1–5 point values
+- Seven international olympiad scrapes (USAPhO, IPhO, APhO, EuPhO, OPhO, PUPC, PhysicsBowl)
+
+## Schema (per record)
+- `messages`: list of `{role, content}` (chat-format problem statement; may include `<image>` tags)
+- `solution`: gold solution / final answer (string; may include LaTeX)
+- `source`: canonical source identifier (e.g., `estonian-2007-lahg-07`)
+- `metadata`: dict with `competition`, `year`, `round`, `problem_number`, `difficulty_native` (Estonian), `language`, `image_paths`
+
+## License
+**CC BY-NC 4.0** — non-commercial; attribution required. Olympiad source materials are typically released by their organizers under non-commercial / educational-use terms; this redistribution honors those constraints. Cite the original olympiad organizers in addition to this dataset.
+
+## Citation
+Anonymous NeurIPS 2026 Datasets and Benchmarks Track submission.