[Feature Request] Add documentation for qml-asteroid

[dodoradio]

Is your feature request related to a problem? Please describe.
qml-asteroid is currently only documented in a few places in the source code. it would be ideal if we could get a documentation page for this, with clear descriptions of all the properties that can be set for each item

Describe the feature you'd like
I'm not sure if this should be on the website, or a text or html file in the qml-asteroid repo, some more opinions are needed

thanks to tydragon for raising this issue

[beroset]

A first step for this is now merged: AsteroidOS/qml-asteroid#38