public function readme(ExtensionInterface $extension)
    {
        $file = null;
        foreach (['README.md', 'readme.md'] as $possibleName) {
            $file = $extension->getBaseDirectory()->getFile($possibleName);
            if ($file->exists()) {
                break;
            }
        }
        if ($file === null) {
            throw new NotFoundHttpException('Not Found');
        }

        try {
            $readme = $file->read();
        } catch (Filesystem\Exception\IOException $e) {
            throw new NotFoundHttpException('Not Found');
        }

        // Parse the field as Markdown, return HTML
        $html = $this->app['markdown']->text($readme);

        $response = new Response($html);

        return $response;
    }