Add dataset card, link to paper

This PR ensures the dataset can be found at https://huggingface.co/papers/2502.08645.

README.md

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+---
+task_categories:
+- robotics
+license: cc-by-nc-4.0
+---
+
+This repository contains the dataset presented in [Re$^3$Sim: Generating High-Fidelity Simulation Data via 3D-Photorealistic Real-to-Sim for Robotic Manipulation](https://huggingface.co/papers/2502.08645).
+
+Code and demos are available at: http://xshenhan.github.io/Re3Sim/.