Add task category and links to paper and code

This PR adds the `image-to-image` task category to the dataset card. It also adds links to the paper and code repository for easier access.

README.md

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+task_categories:
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+license: cc-by-4.0
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 # PST50: Benchmark for Photorealistic Style Transfer
 
 **PST50** is the first benchmark dataset designed for rigorous evaluation of **Photorealistic Style Transfer (PST)**. It includes high-resolution, professionally curated content-style pairs with ground truth stylizations, suitable for both **paired** and **unpaired** evaluation protocols.
 
 This dataset is introduced in the paper:  
 **SA-LUT: Spatial Adaptive 4D Look-Up Table for Photorealistic Style Transfer**
-[Project Page](https://github.com/Ry3nG/SA-LUT) • (link once available)
+[Project Page](https://github.com/Ry3nG/SA-LUT) • [Paper](https://huggingface.co/papers/2506.13465) • [Code](https://github.com/Ry3nG/SA-LUT)
 
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 📜 License: cc-by-4.0
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