Update README.md

README.md

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-### Scraped Esselunga (Italian store) already reprocessed and cleaned (Italian language)
+### Scraped Esselunga Dataset (Italian store):
+- Dataset preprocessed and cleaned
+- Dataset in Italian language
+### Dataset composition:
+- Image files: Scraped images of products/items sold by the store. Image file name = Item name + Extra informations
+- Json files: File containing the items with the full informations scraped available in a map based format {'image-url':value, 'item-field': value, ...}