Show a MRTK2 service to read (and position) QR codes using HoloLens 2

PLEASE PLEASE PLEASE before opening issues:

• read this article first,
• then read this article, especially the build instructions at the end of the article

If you are using Unity 2020 and up with OpenXR, read this https://localjoost.github.io/Upgrading-reading-and-positioning-QR-codes-with-HoloLens-2-to-Unity-2020-+-OpenXR-plugin/

It works. It really works. All of it. I have received dozens of comments, and everyone of those commenters either did not read the blogs properly, or did something different that they thought would not matter. It does. This is a finicky things. But it works. Believe me.