add firestore example?

[jelmerf]

Great work David, your repositories are really helping me understand how it all fits together (vue, nuxt, firebase, auth).

For me the missing piece right now is how to integrate firestore (or rtdb) in this SSR-based example. Your other repo (nuxt-firebase-auth) shows how to add and display items using the firebase rtdb - but it runs in SPA mode. Things obviously are rather different when using SSR.

Are you planning on adding the simple 'items' example to this repo as well? (I'm currently trying to get it to work myself, but don't know if I'm on the right track).