Add wishlist functionality

[edersonbadeca]

As a user
I want to be registered in the system as someone who wishes a book
So that the system knows and stores my wishes.

Acceptance criteria
Given that a book has no copies available.
When I mark the book as wished.
Then The system registers my wish and display in a list in the admin section.

Given that a book has copies available.
When I Try to mark the book as wished.
Then I see a message telling me that there are available copies.