Add dataset card, copyright notice, indexes and tooling

NOTICE.md

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+# Copyright, Licensing and Attribution Notice
+
+## Summary
+
+This repository mirrors 3D assets that were **created by third parties**, together with metadata
+derived from them. Two different sets of rights apply, and they must not be confused.
+
+| Part of the repository | Rights |
+|---|---|
+| `glb/` — the 7,373 asset files | Owned by their **original creators**. Each object keeps the licence attached to it upstream. Nothing in this repository grants you any right to them. |
+| `metadata.csv`, `animations.csv`, `scripts/`, `README.md`, this notice | Produced by the repository author from public structural properties of the files. Offered under **ODC-BY 1.0**, matching the licence of the upstream Objaverse metadata. |
+
+Publishing these files here is **not** a licence grant, a sublicence, or a claim of ownership
+over any asset.
+
+## Where the assets come from
+
+Every file was obtained from [Objaverse and Objaverse-XL](https://objaverse.allenai.org/)
+(Allen Institute for AI), which aggregates 3D objects from sources including Sketchfab and
+public GitHub repositories. Objaverse-XL does not relicense what it indexes: each object remains
+under whatever terms its creator applied — commonly a Creative Commons variant for Sketchfab
+objects, and the licence of the containing repository for GitHub-sourced objects. Some objects
+carry terms that restrict commercial use or require attribution; some carry no explicit licence
+at all.
+
+**There is therefore no single licence covering `glb/`, and none is asserted here.**
+
+## Before you use an asset
+
+Filenames are deliberately unchanged so that every file is traceable. The `object_id` column in
+`metadata.csv` is the upstream identifier:
+
+- `<32-hex>.glb` — an Objaverse 1.0 / Sketchfab UID
+- `<24-hex>_{fbx,glb,gltf}.glb` — an Objaverse-XL object; the suffix records its original format
+
+Resolve the licence and author for a given `object_id` through the Objaverse-XL annotations,
+which carry per-object `license`, `fileIdentifier` and source fields. Determining whether your
+intended use is permitted — and complying with any attribution requirement — is your
+responsibility as the user of the asset, not something this repository can settle for you.
+
+## Purpose of this mirror
+
+The collection is published to support reproducible research on skeletal animation and motion
+generation, as the raw source pool behind the `UniML3D` dataset. It is a convenience copy of
+material that is already publicly indexed; it adds no rights and removes none.
+
+## Requests for removal
+
+If you are a rights holder and an asset here should not be redistributed, it will be removed.
+Open an issue or a discussion on this dataset repository identifying the `object_id` or filename
+and your relationship to the work, and the file will be taken down promptly, without requiring
+you to demonstrate anything further.
+
+## Attribution
+
+Assets: the individual creators of each object.
+Aggregation and identifiers: Objaverse and Objaverse-XL, Allen Institute for AI.
+Derived metadata and tooling: the repository author (see `README.md` for citation).
+
+*This notice describes how the material is offered. It is not legal advice.*