Update README.md

Author: joshspicer

README.md

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 # pihole-dashboard
-Xamarin Forms Shell app to manage your local Pihole 
+A simple [Xamarin Forms Shell](https://docs.microsoft.com/en-us/xamarin/xamarin-forms/app-fundamentals/shell/) app to manage your local [Pi-hole](https://pi-hole.net/) instance. 
 
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