Add route to create book

app/Controller/HelloWorldController.php

@@ -59,4 +59,17 @@ class HelloWorldController
 
         return new GenericResponse("DB stuff");
     }
+
+    #[Route('/create')]
+    public function createDb(EntityManager $em): ResponseInterface
+    {
+        $books = $em->getRepository(Book::class)->findAll();
+        $book = new Book();
+        $book->setTitle(sprintf('Book %d', count($books) + 1));
+        $em->persist($book);
+        $em->flush();
+        dump($book);
+
+        return new GenericResponse("DB stuff");
+    }
 }