VisionOS fully compatible for AR (non-immersive)

1. README including the entire process to setup
2. Initial Scene to be displayed on the emulator
3. Project used as template tested and works (changing names and package and so on to be suitable for any new project)

*Next step: get it fully-immersive
**PS.: on Unity 2022.3.11f1 and XCode v15.1 BETA it is not filling version and DisplayName correctly, but for simulator it is enough. The name on Unity Player Settings is displayed on the app name on VisionOS Simulator