Generic menu implementation

dungeonbattle/menus.py

@@ -0,0 +1,14 @@
+class Menu:
+
+    def __init__(self, values:list):
+        self.values = values
+        self.position = 0
+    
+    def go_up(self):
+        self.position = max(0, self.position -1)
+    
+    def go_down(self):
+        self.position = min(len(self.values)-1, self.position +1)
+    
+    def validate(self):
+        return self.values[self.position]