introduce cloneCard backendFunctionality

Signed-off-by: grnd-alt <salimbelakkaf@outlook.de>

lib/Controller/CardController.php

@@ -90,6 +90,15 @@ class CardController extends Controller {
 	public function update($id, $title, $stackId, $type, $order, $description, $duedate, $deletedAt) {
 		return $this->cardService->update($id, $title, $stackId, $type, $this->userId, $description, $order, $duedate, $deletedAt);
 	}
+	/**
+	 * @NoAdminRequired
+	 * @param $cardId
+	 * @param $targetStackId
+	 * @return \OCP\AppFramework\Db\Entity
+	 */
+	public function clone(int $cardId, ?int $targetStackId = null) {
+		return $this->cardService->cloneCard($cardId, $targetStackId);
+	}
 
 	/**
 	 * @NoAdminRequired