//Add Products Post Type
function product_register() {
    $args = array(
        'label' => __('Products'),
        'singular_label' => __('Product'),
        'public' => true,
        'show_ui' => true,
        'capability_type' => 'post',
        'hierarchical' => false,
        'rewrite' => array('slug'=>'products'),
        'supports' => array('title', 'editor', 'thumbnail', 'excerpt'),
        'show_in_nav_menus' => true
    );

    register_post_type( 'product' , $args );
}
add_action('init', 'product_register');