Add paper link and image-to-image task category

This PR adds a link to the paper to make it easier to find the dataset. It also adds the `image-to-image` task category.

README.md

@@ -1,3 +1,7 @@
----
-license: mit
----
+---
+license: mit
+task_categories:
+- image-to-image
+---
+
+This repository contains the dataset for the paper [Image Demoiréing Using Dual Camera Fusion on Mobile Phones](https://arxiv.org/pdf/2506.08361). This dataset is used for image demoiréing using dual camera fusion on mobile phones.