Add some background on how to use this

[dandv]

I was looking for a texture generation library, and have little experience in the area. The README didn't help :)

At over 1,100 stars for the repo, I'm probably missing something obvious.

[mrdoob]

What questions do you have? 😊

[Newbytee]

I think some (commented) examples could be great for someone not very familiar with things like these.