update readme.md

Author: mckenziearts

readme.md

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 Shopper is an Admin Management build for Laravel 5.6+ (Not yet compatible with Laravel 5.8) which includes all the necessary for your online market application. This project is inspired by [Orchid/Platform](https://github.com/orchidsoftware/platform).
 This package is still in development.
 
+![Shopper Screenshot](https://pix.watch/kvtzzS/NK1CPv.png)
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 # Table of Contents
 
 1. [Requirements](#requirements)