Add usdz format converted from glb files by RealityConverter.
FYI:
remote: warning: See https://gh.io/lfs for more information.
remote: warning: File assets/cell/nuns-cell.usdz is 75.25 MB; this is larger than GitHub's recommended maximum file size of 50.00 MB
remote: warning: GH001: Large files detected. You may want to try Git Large File Storage - https://git-lfs.github.com.
Add usdz format converted from glb files by RealityConverter.
FYI: