Open and Test the pre-built Bookstore. It should be located in the directory $HOME/sapphire_tut2. Explore the project. What can it do that your Bookstore cannot?The Bookstore presents information about three things: books, authors, and publishers. As of now, your Bookstore only presents book information. In the next sections, you will add to your Bookstore and create bindings that present author and publisher information.