[REPO CREATED] geo-alignment

Hello, immersive web folks.

I've just created a new repository to explore a potential geo-alignment
feature for the WebXR Device API:
https://github.com/immersive-web/geo-alignment

Blair MacIntyre has stepped up to write an initial README that sets the
scope for the feature, but in general the goal is to allow devices to align
their coordinate systems with their compasses. This is useful for many AR
scenarios and also a few VR scenarios.

The original conversation about this feature can be found in the proposals
repo Issue #5
<https://github.com/immersive-web/proposals/issues/5>
 which I will now close. All new conversation on geo-alignment should occur
in the new repo Issues:
https://github.com/immersive-web/geo-alignment/issues

- Trevor

p.s. I'm in the middle of adding to the proposals repo README to nail down
how this whole Issue -> Repo -> Feature -> Working Group process happens,
so soon it won't be quite so mysterious and opaque.