basic login check

public/index.php

@@ -59,8 +59,13 @@ $app->map(['GET', 'POST'],'/login', function (Request $request, Response $respon
     $response->getBody()->write('<input type="submit">');
     addFooter($response);
     } else {
-
-        $response->getBody()->write('logged in');
+        $postdata = $request->getParsedBody();
+        if ($postdata['username'] == 'gebruiker' && $postdata['password'] == 'abcd') {
+            $response->getBody()->write('logged in');
+        } else {
+            $response->getBody()->write('username and/or password incorrect');
+        }
+      
     }
     return $response;
 });