Add dataset card

This PR ensures the dataset is linked to (and can be found at) [VideoGrain: Modulating Space-Time Attention for Multi-Grained Video Editing (ICLR 2025)](https://huggingface.co/papers/2502.17258).

README.md

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+---
+tags:
+- video-to-video
+- video-editing
+---
+
+This repository contains the dataset of the paper [VideoGrain: Modulating Space-Time Attention for Multi-Grained Video Editing (ICLR 2025)](https://huggingface.co/papers/2502.17258).
+
+Code: https://github.com/knightyxp/VideoGrain