Basic demo in line with documentation

[chrisbward]

Hi - can we have a model.gltf in the repo please?

Going through a LOT of pain getting this repo working, or verified to be working.

A litmus test would have been ideal, to avoid the frustration... I recommend embedding the model in the repo.

[mariovde-IIO]

The model can be found in this repo: https://github.com/drcmda/floating-shoe