Added dates to table and date Sorting

src/app/sprint-table/sprint-table.component.html

@@ -22,6 +22,20 @@
             <span *ngIf="sortDescending === false">▼</span>
           </span>
         </th>
+        <th (click)="sortByStartDate()" class="sortable">
+            <span>Start</span>
+            <span *ngIf="sortBy === 'startDate'" class="pl-3">
+              <span *ngIf="sortDescending">▲</span>
+              <span *ngIf="sortDescending === false">▼</span>
+            </span>
+          </th>
+          <th (click)="sortByEndDate()" class="endDate">
+            <span>End</span>
+            <span *ngIf="sortBy === 'endDate'" class="pl-3">
+              <span *ngIf="sortDescending">▲</span>
+              <span *ngIf="sortDescending === false">▼</span>
+            </span>
+          </th>
         <th></th>
       </tr>
       </thead>
@@ -30,6 +44,8 @@
       <tr *ngFor="let sprint of filteredItems" [class.table-info]="sprint.id === highlightId">
         <td>{{sprint.id}}</td>
         <td>{{sprint.title}}</td>
+        <td>{{sprint.startDate | date:'dd.MM.yyyy'}}</td>
+        <td>{{sprint.endDate | date:'dd.MM.yyyy'}}</td>
         <td>
           <button class="btn btn-secondary m-2" (click)="openSprintForm(sprint)">Bearbeiten</button>
           <button class="btn btn-secondary m-2" (click)="deleteSprint(sprint)">Löschen</button>