Added Blazor UI with shared Models, View Models and services from Froms App

[lachlanwgordon]

Hi there, Thanks for a fun challenge.

I've refactored as much code as possible into a .Net standard library with no dependency on forms. This allows me to share the bulk of the code between Xamarin Forms Targets(iOS, Android etc.) and Blazor with only views written differently.

I've run out of time to fully implement it so the UI is pretty darn ugly(and the mobile app is a bit broken) but the concept is sound and I've got blazor successfully using all three services.