Scaffolded the GraphBuilder application

Scaffolding the application was difficult. I had to set up Nuget, which
should be performed in the Xamarin.Forms template. There was a bug in
the project template, preventing the app from running on iOS. I had to
research this and manually update the assembly name. Furthermore, I
tried to test the scaffolded app on my iPhone, only to find out that I
needed a developer's license from Apple to do this. The Xamarin warnings
gave me no help. Templates should just work or say why they don't work.
Anything less is unprofessional.