Add dataset card

This PR adds a dataset card for the MJ-VIDEO dataset.

README.md

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+---
+task_categories:
+- video-text-to-text
+license: mit
+tags:
+- video-generation
+- reward-modeling
+---
+
+This repository contains the implementation of the paper "MJ-VIDEO: Fine-Grained Benchmarking and Rewarding Video Preferences in Video Generation".
+
+Paper: https://arxiv.org/abs/2502.01719
+Code: https://github.com/aiming-lab/MJ-Video
+Project Page: https://aiming-lab.github.io/MJ-VIDEO.github.io/
+
+This repository contains the implementation of the paper "MJ-VIDEO: Fine-Grained Benchmarking and Rewarding Video Preferences in Video Generation". We create a fine-grained video preference dataset **MJ-BENCH-VIDEO** and a MoE-structured video reward model **MJ-VIDEO**.