Function booklibrs::actions::book::add_rem::full::add_books

pub fn add_books(
    book_system: &mut BookSystem, 
    reader_base: &ReaderBase, 
    genres: &Genres, 
    caretaker: &mut Caretaker, 
    app: &App, 
    lang: Lang
)

Function that add simple books and the book (if it wasn’t in library) If number of books to add plus number of existing books is more than usize::MAX, than you will receive error. If you have mistakes in input, program will let you know