Add schematics to allow installing using `ng add @kikstart/ui`

[beeman]

We should allow quick installations using the ng add command.

The schematics should:

• [ ] install dependencies
  • [ ] @kikstart/ui
• [ ] install peerDependencies
  • [ ] @ngx-formly/core @ngx-formly/bootstrap
  • [ ] @ctrl/ngx-numbered-codeblock
  • [ ] ngx-bootstrap
  • [ ] ngx-timeago
  • [ ] ngx-toastr
  • [ ] prismjs
• [ ] update AppModule for the selected or default project
• [ ] update styles.scss for the selected or default project
• [ ] add initial configuration object
• [ ] wrap AppComponent in a default layout

After running ng add @kikstart/ui (or a similar package name) the app should be ready to go.

We will initially focus on clean, new Angular apps. It would be a nice-to-have to have more flexibility and work with existing apps.