Update README.md

README.md

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-This is a Swin Transformer model fine-tuned on the REFUGE challenge dataset. It is able to classify an retinal fundns image into glaucoma and non-glaucoma.
+This is a Swin Transformer model fine-tuned on the [REFUGE challenge dataset](https://refuge.grand-challenge.org/). It is able to classify an retinal fundns image into glaucoma and non-glaucoma.
 
 ## Model Details