add basic ui elements

src/app/app.component.ts

@@ -1,9 +1,14 @@
 import { Component } from '@angular/core';
 import { RouterOutlet } from '@angular/router';
+import {MatButtonToggleModule} from '@angular/material/button-toggle'; 
+import {MatButtonModule} from '@angular/material/button';
+import {MatInputModule} from '@angular/material/input';
+import {MatFormFieldModule} from '@angular/material/form-field';
+import {MatListModule} from '@angular/material/list';
 
 @Component({
   selector: 'app-root',
-  imports: [RouterOutlet],
+  imports: [RouterOutlet, MatButtonToggleModule, MatButtonModule, MatInputModule, MatFormFieldModule, MatListModule],
   templateUrl: './app.component.html',
   styleUrl: './app.component.less'
 })