Update README.md

Adds description of the model

README.md

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 metrics:
 - accuracy
 pipeline_tag: image-to-text
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+This model extracts information from EU driver's licenses and returns it as JSON. More details about its training and evaluation can be found in the link below. For optimal performance, we recommend that input images have a size of 1192x772.
+https://medium.com/@ofelipebandeira/transformers-vs-ocr-who-can-read-better-192e6b044dd3