Update README.md

# [CIKM'25] ECKGBench
## Overview
The paper link: [ECKGBench: Benchmarking Large Language Models in E-commerce Leveraging Knowledge Graph](https://arxiv.org/abs/2503.15990).

Source code: https://github.com/OpenStellarTeam/ECKGBench

README.md

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 pretty_name: ECKG
 size_categories:
 - 1K<n<10K
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+---
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