docs(aio): add NgModule docs (#20306)

PR Close #20306

aio/content/examples/ngmodule-faq/src/app/app.module.1.ts

@@ -0,0 +1,52 @@
+// #docplaster
+// #docregion
+/* Angular Imports */
+import { NgModule }           from '@angular/core';
+import { BrowserModule }      from '@angular/platform-browser';
+
+/* App Imports */
+// #enddocregion
+import { AppComponent }       from './app.component.1';
+/*
+// #docregion
+import { AppComponent }       from './app.component';
+// #enddocregion
+*/
+// #docregion
+import { HighlightDirective } from './highlight.directive';
+import { TitleComponent }     from './title.component';
+import { UserService }        from './user.service';
+
+/* Contact Related Imports */
+import { FormsModule }        from '@angular/forms';
+
+import { AwesomePipe }        from './contact/awesome.pipe';
+import { ContactComponent }   from './contact/contact.component.3';
+import {
+  ContactHighlightDirective as ContactHighlightDirective
+} from './contact/contact-highlight.directive';
+
+@NgModule({
+// #docregion imports
+  imports: [ BrowserModule, FormsModule ],
+// #enddocregion imports
+// #docregion declarations, directive, component
+  declarations: [
+    AppComponent,
+    HighlightDirective,
+// #enddocregion directive
+    TitleComponent,
+// #enddocregion component
+
+    AwesomePipe,
+    ContactComponent,
+    ContactHighlightDirective
+// #docregion directive, component
+  ],
+// #enddocregion declarations, directive, component
+// #docregion providers
+  providers: [ UserService ],
+// #enddocregion providers
+  bootstrap: [ AppComponent ]
+})
+export class AppModule { }