Add dataset card

README.md

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+---
+license: apache-2.0
+pretty_name: Test500
+---
+
+# Test500
+
+Tar-sharded speech / TTS dataset with a custom Hugging Face loader.
+Designed for **streaming**, **low memory usage**, and **raw byte access**.
+
+## Loading
+
+```python
+from datasets import load_dataset
+
+ds = load_dataset(
+    "thangylvp/test500",
+    split="train",
+    trust_remote_code=True,
+)
+```
+
+## Sample format
+
+Each sample corresponds to one `(channel, id)`:
+
+- `channel` (string)
+- `id` (string)
+- `transcribe_assembly` (string)
+- `tokenize_vibevoice` (bytes)
+
+## Notes
+
+- Data is stored in `batch_*.tar` shards
+- Files for each sample are written contiguously in tar
+- Audio and binary features are returned as raw bytes