Adding dashboard widget

functions.php

<?php
/**
 * Add a widget to the dashboard.
 *
 * This function is hooked into the 'wp_dashboard_setup' action below.
 */
function wc_orders_dashboard_widgets() {

	wp_add_dashboard_widget(
                 'wc_order_widget_id',         // Widget slug.
                 'WooCommerce Orders',         // Title.
                 'wc_orders_dashboard_widget_function' // Display function.
        );	
}
add_action( 'wp_dashboard_setup', 'wc_orders_dashboard_widgets' );

/**
 * Create the function to output the contents of our Dashboard Widget.
 */
function wc_orders_dashboard_widget_function() {

	echo "Hello World !";
}