Add paper link and image-to-image category

This PR ensures the dataset can be found at https://huggingface.co/papers/2503.08478.

README.md

@@ -1,11 +1,13 @@
 ---
 license: cc-by-nc-sa-4.0
 viewer: false
+task_categories:
+- image-to-image
 ---
 
 # NullFace: Training-Free Localized Face Anonymization
 
-[arXiv](http://arxiv.org/abs/2503.08478)
+[HF中国镜像站 Paper](https://huggingface.co/papers/2503.08478)
 
 ## Test set