add getText method to text controller

app/Text/TextController.php

@@ -29,6 +29,21 @@ class TextController
         return $response->withHeader('Content-Type', 'application/json');
     }
 
+    public function getText(Response $response, int $textId): Response
+    {
+        $text = $this->textRepository->find($textId);
+
+        if ($text === null) {
+            return $response->withStatus(404);
+        }
+
+        $response->getBody()->write(json_encode([
+            'id' => $text->getId(),
+            'name' => $text->getName(),
+        ]));
+        return $response->withHeader('Content-Type', 'application/json');
+    }
+
     public function createText(
         Request $request,
         Response $response,