Merge branch 'frontend-testing' into 'master'

.gitignore

pom.xml

.../ntnu/idatt1002/demo/controller/AddExpenseController.java

...o/ntnu/idatt1002/demo/controller/AddIncomeController.java

...a/no/ntnu/idatt1002/demo/controller/BudgetController.java

...no/ntnu/idatt1002/demo/controller/ExpensesController.java

...a/no/ntnu/idatt1002/demo/controller/IncomeController.java

...no/ntnu/idatt1002/demo/controller/MainMenuController.java

...o/ntnu/idatt1002/demo/data/Budget/FileHandlingBudget.java

...n/java/no/ntnu/idatt1002/demo/data/Economics/Expense.java

...a/no/ntnu/idatt1002/demo/data/Economics/FileHandling.java

...in/java/no/ntnu/idatt1002/demo/data/Economics/Income.java

...main/java/no/ntnu/idatt1002/demo/data/Economics/Item.java

src/main/resources/Budget/Budget.budget

src/main/resources/Economics/Expense.register

src/main/resources/Economics/Income.register

...main/resources/Economics/expenseRegisterTest.itemRegister

src/main/resources/Economics/incomeRegisterTest.itemRegister

src/main/resources/Economics/incomeRegisterTest.register

src/main/resources/Images/add_image 2.png