Week 1
	Admin adds a book
	User searches for books
week 2
	Admin add users
	Registered user borrows a book
	Registered user returns a book
week 3
	Admin adds a CD/DVD
	User searches for CD/DVD
	User borrows a CD/DVD
	User returns a CD/DVD
week 4
	User reserves a book
	Admin deletes a user
	Admin deletes a book
week 5
	User pays fine
	Admin blocks user