Add description to card metadata

#1
by julien-c HF staff - opened

IoU is the area of overlap between the predicted segmentation and the ground truth divided by the area of union
between the predicted segmentation and the ground truth. For binary (two classes) or multi-class segmentation,
the mean IoU of the image is calculated by taking the IoU of each class and averaging them.

julien-c changed pull request status to merged

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