How do I sync contacts between 2 iCloud accounts?
The easiest way to do this as a one time thing, is to open Contacts.app on a Mac that is set up on your iCloud account. Select all contacts and drag them to the desktop. That will export them all as a .vcard file.

Then move the file to another account on a Mac set up with your husband's iCloud account. Open Contacts.app, and drag the .vcard file into the app.

That will get all of your contacts into his account. But this will be a one time thing, and you may get some duplicates.