Better documentation on texture pack support

[sabre230]

Is there an existing issue for this?

• I have searched the existing issues

What feature are you suggesting?

Documentation explaining the usage and limitations of texture packs for both users and developers.

Why would this feature be useful?

Currently, the old Cltra website has a little bit of information on how to set up your texture packs, but it's missing details like how your "pack.json" should be set up or how you can get the ID number it's looking for from the game's texture files. There is no readily available documentation online regarding this.