docs: add a simple example in the readme how to use statsgl in Tresjs

[vercel[bot]]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Comments	Updated (UTC)
stats-gl	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 27, 2023 6:31pm

[JaimeTorrealba]

Hi guys :)

I would like to add a very simple example of how to use stats-gl with Tresjs will be really nice if you could check it :D

[RenaudRohlinger]

Oh, that's nice! Thanks.