Update README.md

README.md

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   - split: test
     path: robustness/test-*
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+ChartAlignBench 🧭📊
+ChartAlignBench is a multi-modal benchmark designed to evaluate Vision-Language Models (VLMs) on dense-level chart grounding and multi-chart alignment.
+It provides fine-grained chart-pair comparisons across multiple visual and semantic dimensions — enabling systematic analysis of how well VLMs can detect, localize, and align subtle chart content differences.