Reset new task input after creation;

src/app/active-list-tasks/active-list-tasks.component.ts

@@ -53,6 +53,7 @@ export class ActiveListTasksComponent implements OnInit, OnDestroy {
         } as Task;
 
         this._taskListService.addTask(newTask);
+        this.newTaskControl.reset();
       }
     }
   }