3. Add code in app.component.html

 <mat-form-field class="example-chip-list">
      <mat-chip-list #chipList aria-label="Fruit selection">
        <mat-chip *ngFor="let fruit of fruits" [selectable]="selectable"
                 [removable]="removable" (removed)="remove(fruit)">
          {{fruit.name}}
          <mat-icon matChipRemove *ngIf="removable">cancel</mat-icon>
        </mat-chip>
        <input placeholder="New fruit..."
               [matChipInputFor]="chipList"
               [matChipInputAddOnBlur]="addOnBlur"
               (matChipInputTokenEnd)="add($event)">
      </mat-chip-list>
    </mat-form-field>