Add dataset README

README.md

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+---
+license: mit
+pretty_name: BMTVG segmentation videos
+tags:
+- markerless-tracking
+- surgical
+- point-cloud
+---
+
+# BMTVG — segmentation videos
+
+Large segmentation videos accompanying the paper **"Bridging the Markerless
+Tracking Validation Gap: Intraoperative X-ray Workflow Integration"** (Daly et
+al.). They are hosted here to keep the code repository within GitHub's free tier.
+
+| File | Size |
+|------|------|
+| `data/seg1.mkv` | ~11.05 GB |
+| `data/seg2.mkv` | ~10.38 GB |
+| `data/seg3.mkv` | ~10.35 GB |
+
+Code, CAD models, and the segmentation point clouds (`*.ply`) live in the GitHub
+repository: **https://github.com/condog101/BMTVG**
+
+## Download
+
+```bash
+pip install huggingface_hub
+huggingface-cli download zcbecda/BMTVG --repo-type dataset \
+    --include "data/*.mkv" --local-dir .
+```