docs(material/timepicker): add a basic docs example

Adds a basic example to work around a CI failure.

Author: crisbeto

src/components-examples/material/timepicker/index.ts

@@ -1 +1 @@
-export const TEMP = true;
+export {TimepickerOverviewExample} from './timepicker-overview/timepicker-overview-example';

src/components-examples/material/timepicker/timepicker-overview/timepicker-overview-example.html

@@ -0,0 +1,6 @@
+<mat-form-field>
+  <mat-label>Pick a time</mat-label>
+  <input matInput [matTimepicker]="picker">
+  <mat-timepicker-toggle matIconSuffix [for]="picker"/>
+  <mat-timepicker #picker/>
+</mat-form-field>

src/components-examples/material/timepicker/timepicker-overview/timepicker-overview-example.ts

@@ -0,0 +1,16 @@
+import {ChangeDetectionStrategy, Component} from '@angular/core';
+import {MatTimepickerModule} from '@angular/material/timepicker';
+import {MatInputModule} from '@angular/material/input';
+import {MatFormFieldModule} from '@angular/material/form-field';
+import {provideNativeDateAdapter} from '@angular/material/core';
+
+/** @title Basic timepicker */
+@Component({
+  selector: 'timepicker-overview-example',
+  templateUrl: 'timepicker-overview-example.html',
+  standalone: true,
+  providers: [provideNativeDateAdapter()],
+  imports: [MatFormFieldModule, MatInputModule, MatTimepickerModule],
+  changeDetection: ChangeDetectionStrategy.OnPush,
+})
+export class TimepickerOverviewExample {}