Add dataset README

README.md

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+---
+license: other
+pretty_name: GeomCAD
+size_categories:
+  - 1M<n<10M
+---
+
+# GeomCAD
+
+Dataset for **GeomCAD: A Benchmark for Precision Reconstruction of Generative CAD Operations from Point Clouds**.
+
+## Layout
+
+```
+extrude_100w/       # training set (to be uploaded)
+loft_100w/          # training set (to be uploaded)
+revolve_100w/       # training set (to be uploaded)
+sweep_100w/         # training set (to be uploaded)
+test/
+  extrude/          # 1500 test samples
+    test_mesh_paths.json   # {"<id>": "<id>/<id>.stl"} relative to test/extrude/
+    <id>/<id>.stl          # ground-truth mesh
+    <id>/<id>.py           # CAD-Recode-style code that produces the mesh
+  loft/             # 1500 test samples
+  revolve/          # 1500 test samples
+  sweep/            # 1500 test samples
+```
+
+| split | operation | #samples | size  |
+|-------|-----------|---------:|------:|
+| test  | extrude   |    1500  |  61 MB |
+| test  | loft      |    1500  | 353 MB |
+| test  | revolve   |    1500  | 409 MB |
+| test  | sweep     |    1500  | 410 MB |
+
+## Usage
+
+```python
+from huggingface_hub import snapshot_download
+local = snapshot_download("FanQY/GeomCAD", repo_type="dataset")
+```