L5.1 romanbican/roles package not inserting any records in db

I'm trying to implement the following package to handle user roles:

http://ift.tt/1CphkOq

What I can't seem to figure out is where to define the roles themselves (the User model maybe?).

In the README, there's this explanation:

use Bican\Roles\Models\Role;

$adminRole = Role::create([
    'name' => 'Admin',
    'slug' => 'admin',
    'description' => '', // optional
    'level' => 1, // optional, set to 1 by default
]);

$moderatorRole = Role::create([
    'name' => 'Forum Moderator',
    'slug' => 'forum.moderator',
]);  

But it doesn't really say where this snippet should be placed. Even when i tried to execute these code snippet in db nothing is happened.

please help me on this

Thanks.

via Chebli Mohamed