Merge pull request 'Aufgabe Woche 3, Codewars Uebung Menu Display Kyu7' (#3) from Woche3 into master

Reviewed-on: #3

Klappt, tiptop.

src/Woche3/menu.py

@@ -0,0 +1,15 @@
+class Menu:
+    def __init__(self, menu):
+        self.menu = menu
+        self.selected = 0
+
+    def to_the_right(self):
+        self.selected = (self.selected + 1) % len(self.menu)
+
+    def to_the_left(self):
+        self.selected = (self.selected - 1) % len(self.menu)
+
+    def display(self):
+        display_array = self.menu[:]
+        display_array[self.selected] = [display_array[self.selected]]
+        return str(display_array)