Add link to full commercial edition

README.md

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 # QM Synthetic Fruit with Ripeness Labels (6 fruits) - Free Sample
 
+> **Full commercial edition: 5,000 images - $25 -> [buy on Gumroad](https://quailcraft1.gumroad.com/l/synthetic-fruit-ripeness)**  
+> This free sample is non-commercial (CC BY-NC-SA 4.0). Custom sizes on request.
+
 Synthetic **fruit + ripeness** images: apples, oranges, lemons, bananas, tomatoes and pears with pixel-exact YOLO
 boxes, and every fruit labelled with a **ripeness stage** (unripe / ripe / overripe, driving skin colour) and
 blemish count in `meta/` - for agritech sorting lines, retail shelf monitoring, food-waste and robotics picking.