Add dataset card, link to paper

This PR ensures the dataset can be found at and is linked to https://huggingface.co/papers/2305.10431.

README.md

@@ -1,3 +1,8 @@
 ---
 license: cc-by-2.0
+task-categories: text-to-image
 ---
+
+This repository contains the dataset used in the paper [FastComposer: Tuning-Free Multi-Subject Image Generation with Localized Attention](https://huggingface.co/papers/2305.10431).
+
+Code: https://github.com/mit-han-lab/fastcomposer