Added puts statements to indicated the creation of each new instance in the Library, Borrower, and Book classes.
Add getter methods for title and author
Implemented the add_book method that adds books to the Library
Updated the list_books method
Added updates pulled from Mike. Includes new getter methods for status and borrower, check_out method in Library class.
Implemented features for each method in the code. Added attr_accessors. Added a check_in method to library.rb and a test for the check_in method to main.rb
Added comments for each class and method