Add link to paper and code

This PR ensures the dataset is linked to https://huggingface.co./papers/2502.17166

README.md

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 # JUREX
 
-Source code and data for *JUREX-4E: Juridical Expert-Annotated Four-Element Knowledge Base for Legal Reasoning*
+Source code and data for [*JUREX-4E: Juridical Expert-Annotated Four-Element Knowledge Base for Legal Reasoning*](https://huggingface.co/papers/2502.17166)
+
+Code: https://github.com/THUlawtech/JUREX
+
 ## Overview
 
 - [Dataset Structure](#dataset-structure)