Added list of datasets

README.md

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 ## Dataset Summary
 
 
-The **ImageNet-Hard** is a new benchmark that comprises an array of challenging images, curated from several validation datasets of ImageNet. This dataset challenges state-of-the-art vision models, as merely zooming in often fails to enhance their ability to correctly classify images. Consequently, even the most advanced models, such as `CLIP-ViT-L/14@336px`, struggle to perform well on this dataset, achieving only `2.02%` accuracy.
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+The **ImageNet-Hard** is a new benchmark that comprises 13,630 images, collected from various existing ImageNet-scale benchmarks (ImageNet, ImageNet-Sketch, ImageNet-C, ImageNet-R, ImageNet-ReaL, ImageNet-A, and ObjectNet). 
+This dataset is challenging to state-of-the-art vision models, as merely zooming in often fails to enhance their ability to classify images correctly. Consequently, even the most advanced models, such as `CLIP-ViT-L/14@336px`, struggle to perform well on this dataset, achieving only `2.02%` accuracy.