Improvements to Getting Started

[wtesler]

It would be nice if there was some description of how to set up Microsoft MRTK to get this project to work.

[jbienz]

That's a really good point @wtesler. I'll try to create a "working with the source code" page at some point. In the meantime, this is a good walkthrough for getting MRTK setup in a project:

https://docs.microsoft.com/en-us/learn/modules/learn-mrtk-tutorials/1-3-exercise-configure-unity-for-windows-mixed-reality?tabs=openxr

Note that Refract doesn't actually use the full MRTK runtime and doesn't even need MRTK to be initialized. Refract just uses the 3D assets and their Interactable control model.