Application used to control Visma's library
Use these commands to control application.
quit - quits application.
add (book_name) (author) (category) (language) (publication_date) (isbn) - add new book to library
Example: add Vagis Jonas_Biliunas drama lt 1905-06-12 9789986094814
readall (book_property) - lists all books ascending order.
Example: readall isbn
available properties: name, author, category, language, isbn, taken.
take (book_name) (user) (period_month) - gives book to user.
Example: take Vagis anonymous 1
return (book_name) (user) - removes book from user.
Example: return Vagis anonymous
delete (book_name) or (author) - removes book from library.
Example: delete Vagis