Update README.md

README.md

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-main dataset
+## NeedleChain: Measuring Intact Long-Context Reasoning Capability of Large Language Models
+
+<p align="center">
+    Github: <a href="https://github.com/hyeonseokk/NeedleChain"> Official github repository </a>
+<br>
+    Paper: <a href="https://arxiv.org/abs/2507.22411"> Official Paper </a>
+<br>
+
+---
+<p align="center">
+  <img src="needlechain.png" width="500"/>
+</p>
+
+NeedleChain is a benchmark designed to evaluate LLMs' intact long-context understanding. 
+Every provided context consists of query-relevant information, requiring a comprehensive understanding to answer the given query.
+
+---
+
+For manual creation of NeedleChain datasets, please refer to our official github repository.
+