Overall ecosystem documentation

[ssfrr]

There are a bunch of GL-related packages and it's tough as a newcomer to know what package is responsible for what. Many of the examples for the various packages use using to pull in multiple GL packages before doing anything, so they don't clarify which functions come from which packages.

One thing that would be helpful is some overall documentation for the ecosystem that describes how the different packages relate to each other, and which ones are intended to be user-facing.

It would also help if the examples either used import to pull in packages and then used qualified names, or used the using Pkg: foo, bar syntax so it's clear which functions come from which packages.

There's a huge amount of good stuff in the JuliaGL org, but it's a bit daunting to get into ATM.