Is your feature request related to a problem? Please describe.
Adding an example of trained registration network

Describe the solution you'd like
With standard segmentation-driven methods, weakly supervising registration, with or without unsupervised loss

Describe alternatives you've considered
Unsupervised registration

Additional context
Using public data set: https://zenodo.org/record/7013610

@kate-sann5100 @wyli @mathpluscode