How to add categories to products in woocommerce programatically? [closed]

I think the function you are looking for is called wp_insert_term() in WordPress core.
Woocommerce uses WordPress-taxonomy called product_cat

So if you want to add some categories for example phones:

function wpse_insert_term()
{
    wp_insert_term(
      'phones',
      'product_cat', // the taxonomy
      array(
        'description'=> 'A yummy phone.',
        'slug' => 'phone',
      )
    );
}
add_action('init', 'wpse_insert_term');