Update qanda_category.php

Readded an old function + Comment, cause its used in a project and its is mentionend in the documentation.

lib/qanda_category.php

@@ -49,4 +49,20 @@ public function find(int $status = 1): ?rex_yform_manager_collection
     {
         return qanda::query()->where('status', $status, '>=')->whereListContains('category_ids', $this->getId())->find();
     }
+
+
+    /**
+     * Findet alle Fragen, die zu dieser Kategorie gehören.
+     * Finds all questions that belong to this category.
+     *
+     * @return rex_yform_manager_collection|null
+     *
+     * Beispiel / Example:
+     * $questions = $category->getAllQuestions();
+     */
+	public function getAllQuestions()
+    {
+        return qanda::query()->where('status', 0, ">")->whereListContains('category_ids',$this->id)
+            ->find();
+    }
 }