Description of changes

SwiftUI preview fot offer code view.

Checklist:

[x] I have performed a self-review of my own code
[ ] I have commented my code, particularly in hard-to-understand areas
[ ] I have made corresponding changes to the readme
[ ] My changes generate no new warnings
[ ] I have added unit tests that prove my fix is effective or that my feature works
[x] New and existing unit tests pass locally with my changes
[ ] I have checked that my views are accessible
[ ] I have checked that my strings are localized where applicable