Adding a WooCommerce product programmatically.

add-woocommerce-product.php

<?php
$args = array(	   
	'post_author' => 1, 
	'post_content' => '',
	'post_status' => "draft", // (Draft | Pending | Publish)
	'post_title' => '',
	'post_parent' => '',
	'post_type' => "product"
); 

// Create a simple WooCommerce product
$post_id = wp_insert_post( $args );

// Setting the product type
wp_set_object_terms( $post_id, 'simple', 'product_type' );

// Setting the product price
update_post_meta( $post_id, '_price', 0 );
update_post_meta( $post_id, '_regular_price', 0 );