Creating a clean independent page within wordpress

So I know you can simply go into the root directory, create a php file and copy-paste the following:

<?php
/* Don't remove this line. */
require('./wp-blog-header.php');
?>

<?php get_header(); ?>

	<div class="main">		

		<div class="content">

this is where my stuff goes...

		</div>

		<div class="clearer"><span></span></div>

	</div>
<?php get_footer(); ?>

</div>

This will create a standalone page that is represented by
https://website.com/theurl.php

However, it is not congruent with the URL format of wordpress, ie. https://website.com/theurl/

Is there a way to do this cleanly? perhaps even putting the page in question into the wp-content/themes/nameoftheme/* directory where the rest of the theme files live?

Thank you.