Add answer text field

src/app/content-answers/content-answers.component.html

+<mat-card>
+  <mat-form-field>
+      <textarea matInput placeholder="Answer"></textarea>
+  </mat-form-field>
+</mat-card>
+
 <mat-card>
   <mat-card-content>
     <h2 class="example-h2">Checkbox configuration</h2>