Add a bunch of placeholder files

Placeholder files for future app structure
Also figured out how to have root url code stuff

frontend-reactive/tests/unit/routes/application-test.ts

@@ -0,0 +1,11 @@
+import { module, test } from 'qunit';
+import { setupTest } from 'frontend-reactive/tests/helpers';
+
+module('Unit | Route | application', function (hooks) {
+  setupTest(hooks);
+
+  test('it exists', function (assert) {
+    const route = this.owner.lookup('route:application');
+    assert.ok(route);
+  });
+});