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/firebase.json

@@ -0,0 +1,14 @@
+{
+  "database": {
+    "rules": "database.rules.json"
+  },
+  "hosting": {
+    "public": "dist",
+    "rewrites": [
+      {
+        "source": "**",
+        "destination": "/index.html"
+      }
+    ]
+  }
+}