Update README.md

README.md

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-license: mit
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+---
+license: mit
+---
+
+# ISSTAD Extended Dataset
+
+This dataset is prepared for the **extended experiments** of the ISSTAD method proposed in  
+[https://github.com/xjspin/ISSTAD](https://github.com/xjspin/ISSTAD).  
+The extended version and related code can be found at:  
+[https://github.com/xjpp2016/ISSTAD_Extended](https://github.com/xjpp2016/ISSTAD_Extended).
+
+---
+
+## 📦 Contents
+
+This dataset includes all the required files for running the ISSTAD extended experiments. It contains:
+
+- **MVTec AD**
+- **VisA**
+- **MPDD**
+
+The directory structure and file names are organized to be compatible with the code directly.
+
+---
+
+## 🚀 Usage
+
+After downloading, simply **extract the dataset to the root directory of the code repository**.  
+No further preprocessing is needed.
+