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/e2e/app.e2e-spec.ts

@@ -0,0 +1,14 @@
+import { SitePage } from './app.po';
+
+describe('site App', function() {
+  let page: SitePage;
+
+  beforeEach(() => {
+    page = new SitePage();
+  });
+
+  it('should display message saying app works', () => {
+    page.navigateTo();
+    expect(page.getParagraphText()).toEqual('app works!');
+  });
+});