updated readme

added class-level poker cards

Updated readme with new downstream task labels for three

changed three downstream task to poker hands

added downstream task to three

corrected concept labels

added missing info about card coordinates

fixed headings

added classes and concepts txts, removed duplicate images, updated README

added three images and split

added three_card_poker images

added remaining single images

added second batch of single images

added first batch of single images

added dataset splits

initial commit