Lagt inn første utgave av lf, samt testene, i ny gren lf

kont2020/src/main/java/food/Customer.java

kont2020/src/main/java/food/Kitchen.java

kont2020/src/main/java/food/MealOrder.java

kont2020/src/main/java/food/ObserveToPrintTopRevenue.java

...c/main/java/food/RebateEveryFifthBuyFromSameCustomer.java

kont2020/src/main/java/food/RebateFreeEveryThousandSale.java

kont2020/src/main/java/stuff/AverageComputerTest.java

kont2020/src/main/java/stuff/MathController.java

kont2020/src/main/java/stuff/Movie.java

kont2020/src/main/java/stuff/MovieRegister.java

kont2020/src/test/java/food/CustomerTest.java

kont2020/src/test/java/food/GatherStatisticsTest.java

kont2020/src/test/java/food/KitchenObserverTest.java

kont2020/src/test/java/food/KitchenTest.java

kont2020/src/test/java/food/PriceProviderTest.java

kont2020/src/test/java/stuff/MovieRegisterTest.java

kont2020/src/test/java/stuff/MovieTest.java