add textarea to blogpost

public/index.php

@@ -75,6 +75,8 @@ $app->map(['GET', 'POST'], '/blog/create', function (Request $request, Response
             $response->getBody()->write('<input type="text" name="slug"/><br/>');
             $response->getBody()->write('<label for="title">Titel:</label>');
             $response->getBody()->write('<input type="text" name="title"/><br/>');
+            $response->getBody()->write('<label for="content">Inhoud:</label>');
+            $response->getBody()->write('<textarea type="textarea" name="content"></textarea><br/>');
             $response->getBody()->write('<input type="submit"/>');
             addFooter($response);
         } else {