Add ProductScreen previews for different UI states#57

Kyriakos-Georgiopoulos wants to merge 2 commits into

google-pay:maingoogle-pay/android-quickstart:mainfrom

Kyriakos-Georgiopoulos:feature/add-product-screen-previewsKyriakos-Georgiopoulos/android-quickstart:feature/add-product-screen-previewsCopy head branch name to clipboard