Update README.md

README.md

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     path: robustness/test-*
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-ChartAlignBench 🧭📊
+## 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.
+ChartAlignBench is a multi-modal benchmark designed to evaluate vision-language Models (VLMs) on dense-level chart grounding and multi-chart alignment to comprehensively assess fine-grained chart understanding in VLMs. 
+
+
+### 🌐 Overview
+
+ChartAlignBench contains 9K+ chart pairs, divided into three evaluation subsets:-
+1. Data Grounding & Alignment: Paired charts differ in underlying data values visualized by the chart.
+2. Attribute Grounding & Alignment: Paired charts differ in visualization attribute e.g., color, legend or text style.
+3. Robustness: 5 variants of paired charts for Data Alignment, with different attributes across variants.