has added a CSV format promotions file when running --promos. Item.py was added for moduling.

item.py

@@ -0,0 +1,13 @@
+class Item:
+    """
+    A class representing a product in some supermarket.
+    """
+
+    def __init__(self, name: str, price: float, manufacturer: str, code: int):
+        self.name: str = name
+        self.price: float = price
+        self.manufacturer: str = manufacturer
+        self.code: int = code
+
+    def __repr__(self):
+        return str((self.name, self.price, self.manufacturer, self.code))