Simple way to add a widgetarea to a Genesis Childtheme

register_widget.php

<?php
/** 
 * Register widget areas for Genesis Childthemes
 * Includes i18n for name and description. 
 */
genesis_register_sidebar( array(
	  'id'          => 'Widgetarea_slug',
	  'name'        => __( 'Title of your widgetarea', 'example' ),
	  'description' => __( 'Description that is shown in the admin of your WordPress website', 'example' ),
) );

/**
 * Adds widgetarea to your site. 
 */
function tv_add_widgetarea_to_theme_genesis() {
  echo '<div id="widgetarea_containerdiv"><div class="wrap">';

	// Change 'true' to specific page to show/hide widget area on that page
	// E.g. is_home() 
	if ( true ) {
		genesis_widget_area( 'Widgetarea_slug', array(
			'before' => '<div id="widgetarea_div_id" class="widgetarea_div_class">',
			'after'  => '</div>',
		) );
	}
}
add_action( 'genesis_after_header', 'tv_add_widgetarea_to_theme_genesis' );