Add task category and tags to dataset card

This PR adds the `task_categories` (image-to-video) and relevant tags (`video-generation`, `trajectory-control`, `segmentation`, `bounding-box`) to the dataset card metadata for improved discoverability on the Hugging Face Hub.

README.md

@@ -1,6 +1,14 @@
 ---
 license: apache-2.0
+task_categories:
+- image-to-video
+tags:
+- video-generation
+- trajectory-control
+- segmentation
+- bounding-box
 ---
+
 [[Paper](https://arxiv.org/pdf/2503.16421)] [[Project Page](https://quanhaol.github.io/magicmotion-site/)] [[Github](https://github.com/quanhaol/MagicMotion)]
 
 ## 🧙 MagicData Dataset