commercial unit area and overhead stuff

ui/hv2-ui/src/app/commercial-unit-details/commercial-unit-details.component.html

@@ -22,6 +22,10 @@
                                 <mat-option *ngFor="let p of premises" [value]="p.id">{{p.description}}</mat-option>
                             </mat-select>
                         </mat-form-field>
+                        <mat-form-field appearance="outline">
+                            <mat-label>Fläche</mat-label>
+                            <input type="number" matInput name="area" [(ngModel)]="commercialPremise.area"/>
+                        </mat-form-field>
                     </div>
                     <button #submitButton type="submit" mat-raised-button color="primary">Speichern</button>
                 </form>