first implementation of controller

Entity/SingleTask.php

@@ -130,9 +130,21 @@ class SingleTask extends AbstractTask
      *
      * @return \DateInterval
      */
-    public function getWarningInterval(): ?\DateInterval
+    public function getWarningInterval()
     {
         return $this->warningInterval;
     }
+    
+    function getRecurringTask(): RecurringTask
+    {
+        return $this->recurringTask;
+    }
+
+    function setRecurringTask(RecurringTask $recurringTask)
+    {
+        $this->recurringTask = $recurringTask;
+    }
+
+
 }