You need to add a file container. If you use the latest snapshot (from last night), you can use code similar to:

use Jellybean::App;

my $webroot = '/path/to/your/web/files';

my $app = Jellybean::App->new(
    HTTP     => { LocalPort => 5000 },
    contains =>
    {
        default =>
        {
           type    => 'File',
           basedir => $webroot,
        },
    },
);

$app->loop();
[download]

Be sure you've installed all of the dependencies; run Build.PL to be sure.