Create a zero-filled model and Shepp-Logan dataset

[jonasteuwen]

Is your feature request related to a problem? Please describe. A zero-filled model and a Shepp-Logan dataset is missing.

Describe the solution you'd like Implement:

• [ ] A zero-filled model and,
• [x] Shepp-Logan dataset + example.

[github-actions[bot]]

This issue is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 15 days

[jonasteuwen]

@georgeyiasemis Now the zero-filled model, is basically just a very very simple engine, so it's on the same footing as the rest.

[github-actions[bot]]

This issue is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 15 days