feat(demo): add landing page with docs (#1951)

docs/app/@core/data/data.module.ts

@@ -0,0 +1,37 @@
+/**
+ * @license
+ * Copyright Akveo. All Rights Reserved.
+ * Licensed under the MIT License. See License.txt in the project root for license information.
+ */
+
+import { NgModule, ModuleWithProviders } from '@angular/core';
+import { CommonModule } from '@angular/common';
+
+import { HeaderMenuService } from './service/header-menu.service';
+import { ReviewsService } from './service/reviews.service';
+import { DescriptionsService } from './service/descriptions.service';
+
+const SERVICES = [
+  HeaderMenuService,
+  ReviewsService,
+  DescriptionsService,
+];
+
+@NgModule({
+  imports: [
+    CommonModule,
+  ],
+  providers: [
+    ...SERVICES,
+  ],
+})
+export class DataModule {
+  static forRoot(): ModuleWithProviders {
+    return <ModuleWithProviders>{
+      ngModule: DataModule,
+      providers: [
+        ...SERVICES,
+      ],
+    };
+  }
+}