Registering a shortcode UI for pullquotes

example.php

<?php

add_action( 'init', 'register_fusion_pullquote_ui' );

function register_fusion_pullquote_ui() {
	shortcode_ui_register_for_shortcode(
		'fusion-pullquote',
		array(
			'label' => 'Pullquote',
			'listItemImage' => 'dashicons-editor-quote',
			'attrs' => array(
				array(
					'label' => 'Quote',
					'attr'  => 'content',
					'type'  => 'textarea',
				),
				array(
					'label' => 'Source',
					'attr'  => 'source',
					'type'  => 'text',
				),
			),
		)
	);
}