npm install firebase angularfire2
Authentification implemented by: https://blog.paulhalliday.io/2017/09/08/ionic-3-and-firebase-user-authentication/
https://firebase.google.com/docs/web/setup
Shows CRUD-operations.
Firebase Item-List with added Ref-Key for update- and delete-operation. Uses observable for list binding (async-pipe). Works with ion-item-sliding in the view for delete-operation.