Improve dataset card: Add metadata and project page link

This PR enhances the dataset card by adding crucial metadata and a direct link to the project page.

Key improvements include:
- Addition of `task_categories: image-text-to-text` for better classification.
- Inclusion of relevant `tags` such as `multimodal`, `reasoning`, and `reinforcement-learning`.
- Specification of `license: cc-by-4.0` for usage clarity.
- Addition of `language: en` and `size_categories: 10k<n<100k` for improved discoverability.
- Integration of the project page URL in the content section.

These updates improve the dataset's discoverability and provide more comprehensive information for users on the Hugging Face Hub.

README.md

@@ -1,4 +1,14 @@
 ---
+license: cc-by-4.0
+task_categories:
+- image-text-to-text
+tags:
+- multimodal
+- reasoning
+- reinforcement-learning
+language: en
+size_categories:
+- 10k<n<100k
 dataset_info:
   features:
   - name: id
@@ -26,9 +36,10 @@ configs:
     path: data/train-*
 ---
 
-
 This is the official release of the training data for paper **PAPO: Perception-Aware Policy Optimization for Multimodal Reasoning**. (arxiv.org/abs/2507.06448)
 
+Project page: [https://mikewangwzhl.github.io/PAPO/](https://mikewangwzhl.github.io/PAPO/)
+
 (Optional) This dataset can be used as the `val` split of the training dataset for PAPO. You may find the full training dataset at [PAPOGalaxy/PAPO_ViRL39K_train](https://huggingface.co/datasets/PAPOGalaxy/PAPO_ViRL39K_train).
 
 # Data Source