adding some documentation

Diagrams/Class Diagram 1.drawio

oopg.txt

opgOversikt.txt

...n/java/edu/ntnu/stud/menubuilder/TrainDispatchSystem.java

src/main/java/edu/ntnu/stud/menubuilder/menu/Menu.java

src/main/java/edu/ntnu/stud/menubuilder/menu/MenuItem.java

...main/java/edu/ntnu/stud/menubuilder/trainz/Departure.java

...va/edu/ntnu/stud/menubuilder/trainz/InformationBoard.java

.../java/edu/ntnu/stud/menubuilder/trainz/DepartureTest.java