docs: add submission date for lab4

docs: add README with student info and project description

feat: implement task 6 - generate SMS messages based on book count

feat: implement task 5 - find maximum books per visitor

feat: implement task 3 - sort books by publication year

feat: implement task 3 - sort books by publication year

feat: implement task 2 - display unique books list and count

Initial commit

Add hello program that greets user

initial commit