add element rich text

backend/app/Element/Element.php

@@ -10,6 +10,7 @@ class Element
         private int $id,
         private string $title,
         private string $description,
+        private string $richText,
         private Set $set,
         private ?Element $parentElement,
     ) {
@@ -30,6 +31,11 @@ class Element
         return $this->description;
     }
 
+    public function getRichText(): string
+    {
+        return $this->richText;
+    }
+
     public function getSet(): Set
     {
         return $this->set;