[docs] add dataset card

README.md

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+---
+license: mit
+task_categories:
+- robotics
+---
+
+# Dataset of Reactive Diffusion Policy
+
+## Contents
+
+- [Description](#description)
+- [Structure](#structure)
+- [Usage](#usage)
+
+## Description
+
+This is the raw dataset used in the paper
+[Reactive Diffusion Policy: Slow-Fast Visual-Tactile Policy Learning for Contact-Rich Manipulation](https://reactive-diffusion-policy.github.io).
+
+- [Paper](https://arxiv.org/pdf/2503.02881)
+- [Project Homepage](https://reactive-diffusion-policy.github.io)
+- [GitHub Repository](https://github.com/xiaoxiaoxh/reactive_diffusion_policy)
+
+## Structure
+
+We offer two versions of the dataset:
+one is the [full dataset](https://huggingface.co/datasets/WendiChen/reactive_diffusion_policy_dataset/tree/main/dataset_full) used to train the models in our paper,
+and the other is a [mini dataset](https://huggingface.co/datasets/WendiChen/reactive_diffusion_policy_dataset/tree/main/dataset_mini) for easier examination.
+Both versions include subsets of peeling, wiping and lifting.
+Each subset is structured as follows:
+
+```
+subset_name
+├── seq_01.pkl
+├── seq_02.pkl
+├── ...
+```
+Note that we split the full lifting subset into 2 parts due to file size restrictions.
+
+## Usage
+
+Follow the [README in our GitHub repo](https://github.com/xiaoxiaoxh/reactive_diffusion_policy)
+to [postprocess the data](https://github.com/xiaoxiaoxh/reactive_diffusion_policy#data-postprocessing)
+and [train the model](https://github.com/xiaoxiaoxh/reactive_diffusion_policy#-training).