Add new userrole to wordpress admin

/*==================================================== Add New User Roles ======================================== */
add_role( 'author', __( 'Author' ),
    array(

    'read' => false, 
    'edit_posts' => false, 
    'edit_pages' => false, 
    'edit_others_posts' => false, 
    'create_posts' => false, 
    'manage_categories' => false, 
    'publish_posts' => false, 
    'edit_themes' => false, 
    'install_plugins' => false, 
    'update_plugin' => false, 
    'update_core' => false 

    )
);

add_role( 'editor', __( 'Editor' ),
    array(

    'read' => true, 
    'edit_posts' => true, 
    'edit_pages' => true, 
    'edit_others_posts' => true, 
    'create_posts' => true, 
    'manage_categories' => true, 
    'publish_posts' => true, 
    'edit_themes' => false, 
    'install_plugins' => false, 
    'update_plugin' => false, 
    'update_core' => false 
    )
);

add_role('user', __(
    'User'),
    array(
        'read'              => true, 
        'create_posts'      => false,
        'edit_posts'        => false, 
        'edit_others_posts' => false, 
        'publish_posts'     => false, 
        'manage_categories' => false, 
    )
);