Add dataset card

README.md

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+---
+configs:
+- config_name: default
+  data_files:
+  - split: train
+    path: data/train-*.parquet
+  - split: val
+    path: data/val-*.parquet
+dataset_info:
+  features:
+  - name: image
+    dtype: image
+  - name: id
+    dtype: int32
+  - name: width
+    dtype: int32
+  - name: height
+    dtype: int32
+  - name: annotations
+    dtype: string
+license: cc-by-4.0
+task_categories:
+- object-detection
+tags:
+- object365
+- detection
+- coco-format
+---
+
+# Objects365 Dataset
+
+Objects365 detection dataset in HuggingFace parquet format.
+
+## Schema
+
+| Column | Type | Description |
+|--------|------|-------------|
+| image | Image | RGB image (PIL) |
+| id | int32 | Image ID matching COCO annotation |
+| width | int32 | Image width |
+| height | int32 | Image height |
+| annotations | string | JSON-serialized annotations list |
+
+## Usage
+
+```python
+from datasets import load_dataset
+
+ds = load_dataset("surenreddy/object365", split="train")
+```
+
+Annotations are available as COCO-format JSON files in the repo root:
+- `zhiyuan_objv2_train.json`
+- `zhiyuan_objv2_val.json`