Add README for product logos

public/img/products/README.md

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+Generated with https://designer.microsoft.com/image-creator
+
+Prompt:
+A *(animal)* in an open field with mountains in the background, low poly, faceted style, light green background.
+
+Where *(animal)* was one of
+
+- chestnut horse
+- dalesbred sheep with light brown body and black horns
+- monkey
+
+The generated picture was then cropped manually.