Improve dataset card: add metadata and links

README.md

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 license: mit
+task_categories:
+- text-generation
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+# LM-Lexicon
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+This repository contains the dataset for the paper [LM-Lexicon: Improving Definition Modeling via Harmonizing Semantic Experts](https://huggingface.co/papers/2602.14060).
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+[**Project Page**](https://lm-lexicon.github.io) | [**GitHub**](https://github.com/jacklanda/LMLexicon)
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+LM-Lexicon is an innovative definition modeling approach that incorporates data clustering, semantic expert learning, and model merging using a sparse mixture-of-experts (MoE) architecture. By decomposing the definition modeling task into specialized semantic domains, LM-Lexicon achieves substantial improvements over existing methods on five widely used benchmarks.
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 **BibTeX:**
 ```bibtex
 @article{liu2026lmlexiconimprovingdefinitionmodeling,