importing external router file

src/app/app.module.ts

@@ -6,7 +6,7 @@ import { AboutComponent } from './about/about.component';
 import { ResumeComponent } from './resume/resume.component';
 import { LinksComponent } from './links/links.component';
 
-import { RouterModule }   from '@angular/router';
+import { AppRoutingModule }     from './app-routing.module';
 
 @NgModule({
   declarations: [
@@ -16,7 +16,8 @@ import { RouterModule }   from '@angular/router';
     LinksComponent
   ],
   imports: [
-    BrowserModule
+    BrowserModule,
+    AppRoutingModule
   ],
   providers: [],
   bootstrap: [AppComponent]