[Feat] Add ng add support

[brandonroberts]

• Updates the package.json
• Adds RoutingModule.forRoot() to the AppModule

[santoshyadavdev]

I will take it Brandon.

[santoshyadavdev]

@brandonroberts is folder structure looks fine to you, Sorry for asking, actually I know plugins create a separate lib for schematics and builder, but here we are creating schematics as part of the library, which I have not done as part of Nx so a little bit confused here.

[brandonroberts]

Yea, we'll have to compile the schematics separately, and probably use the @schematics/angular package or another utility library to add the imports for RoutingModule.forRoot() to an NgModule.

[santoshyadavdev]

Cool, thanks 😊.