- [ ] collections support
    - [ ] front-side
        - [ ]
    - [ ] back-side
        - [x] db model support
        - [ ] CRUD collections support
            - [ ] create collections
            - [ ] books management
                - [ ] add books
                - [ ] change books sequence (next release)
                - [ ] remove books
            - [ ] show list books in collections
            - [ ] delete collections
        - [ ] permissions and share collections
            - [ ] allow edit collections to users
            - [ ] share collections