dashboard_widget_functions.php

<?php
function wdt_dashboard_widget_content() {
	echo '<h3>Images</h3>
	<ul>
		<li>Featured 1080×608px</li>
		<li>Person 600×600px</li>
		<li>Sponsor Logo 400×200px</li>
	</ul>';
	echo '<h3>Colors</h3>
	<ul>
		<li>Primary (blue) #0274be</li>
		<li>Secondary (violet) #be0274</li>
	</ul>';
  	echo '<hr>
	<p>
		Contact <a href="https://webdevtrust.com">webdevtrust</a> for support
  	<p>';
}
function add_dashboard_widgets() {
	wp_add_dashboard_widget(
		'wdt_dashboard_widget', // slug.
		'<img src="' . get_stylesheet_directory_uri() . '/img/logo-dashboard.png">', // title.
		'wdt_dashboard_widget_content' // function.
	);
}
add_action( 'wp_dashboard_setup', 'add_dashboard_widgets' );