- Added all public functions documentation in README.md
- Fixed missing id in the original database.txt
- Fixed missing id in Person constructor

- Refactored the entire LogInSystem.cpp
- Renamed Person.h into Person.hpp
- Added "int id" into Person.hpp
- Added getter and setter for id in Person.cpp
- Updated README.md with description of each functions

- README.md added for the project
- Person.cpp commented