Add a "Full sample" template

[mauroservienti]

The default template should be as simple as possible, ready to start with nothing to delete.
We should add a "full sample" template that creates a more complex app that can be used as a playground

[micdenny]

+1

Just boostrapper with a MainView + MainViewModel? or also a MainContent region on the MainView with a injected MainContentView+MainContentViewModel? Maybe manually injected from a broker hook?