call out threejs as a (peer) dependency

[thescientist13]

Maybe I just missed it in the installation docs, but when trying out Lume, I was getting issues because three.js was not found

Checking with npm, I could see that three was technically in the dependency graph

greenwood-lume@1.0.0 /Users/owenbuckley/Workspace/github/greenwood-lume
└─┬ lume@0.3.0-alpha.44
  ├─┬ @lume/three-projected-material@0.3.1
  │ └── three@0.174.0 deduped
  └── three@0.174.0

But it is only a peerDependency of lume, but I didn't see it explicitly called out in the docs that this package needed to be "vendored" as such?

The solution was simply to npm i three but I think an explicit callout in the docs would be helpful 👍