Update README.md

README.md

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 ## About
-This is a derivative of the TotalSegmentator dataset, with 1228 CT images and corresponding segmentation mask of 117 structures.
+This is a derivative of the [TotalSegmentator](https://github.com/wasserth/TotalSegmentator) dataset, with 1228 CT images and corresponding segmentation mask of 117 structures.
 
 - We combined multiple segmentation masks into a single `nii.gz` file under the folder `Masks`, 
 and moved all CT images to the folder `Images`.