feat(aio): add initial angular-cli scaffold (#14118)

- adds initial CLI-generated app
- adds material toolbar
- initial (very rough) scss setup, lifted from angular/material
- initial routing scaffold w/ homepage

angular.io/src/app/app.component.ts

@@ -0,0 +1,10 @@
+import { Component } from '@angular/core';
+
+@Component({
+  selector: 'app-shell',
+  templateUrl: './app.component.html',
+  styleUrls: ['./app.component.scss']
+})
+export class AppComponent {
+  title = 'app works!';
+}