Mars Globe

@larsnaesbye @bevans2000 

Now that https://mars-sim.com is up and running, do feel free to edit it and add contents.

Q: how would you like to incorporate a Mars Globe on our project web page ?

By far, this one is one of the best open source Mars rendering. It uses low CPU resources, WebGL enable and does some raycasting, etc.
> https://jsulpis.github.io/realtime-planet-shader/mars/
