Make a better HOWTO section.

[schroef]

Your intro starts with "Simply add this line to your page". But its not as simple as that. Since the file needs to have correct structure of how the sitemap is made. I tried one setup using sitemap.org and returns complete blank page. Then tried only using your stylesheet, i do get something, but it doesnt build the page properly

[schroef]

PS this page returns nothing:
https://gitcdn.xyz/repo/pedroborges/xml-sitemap-stylesheet/master/sitemap.xsl