- LogInSystem is now a class
- All source files are moved into src folder
- Updated README.md to reflect the codes' current progress
- renamed vehiclesData.txt to vehiclesData.json
- 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