Add a sub module to group common components

This module declares shared components and exports them. To use in another module you can simply add SharedModule in the imports section.

src/app/shared/shared.module.ts

@@ -0,0 +1,21 @@
+import { NgModule } from '@angular/core';
+import { CommonModule } from '@angular/common';
+import { LayoutComponent } from './layout/layout.component';
+import { TitleComponent } from './title/title.component';
+import { RouterModule } from '@angular/router';
+
+@NgModule({
+  imports: [
+    CommonModule,
+    RouterModule,
+  ],
+  exports: [
+    LayoutComponent,
+    TitleComponent,
+  ],
+  declarations: [
+    LayoutComponent,
+    TitleComponent,
+  ],
+})
+export class SharedModule { }