feat(shop): initial shop implementation with buy functionality and item loading

src/shop.py

@@ -0,0 +1,29 @@
+from src.item import Item
+
+
+class Shop:
+    def __init__(self, ects, buyable_items):
+        self.ects = ects  # give the ects object ot the shop
+        self.buyable_items: list[Item] = buyable_items  # give the buyable items to the shop
+
+    def buy(self, item_name):
+        item_to_buy = self.get_item(item_name)
+        if item_to_buy is None:
+            return False
+
+        cost = item_to_buy.get_cost()
+        if self.ects.is_over_balance(cost):
+            return False
+
+        self.ects.decrease_balance(cost)
+        # self.buyable_items.remove(item_to_buy)
+        return True
+
+    def get_item(self, item_name):
+        for item in self.buyable_items:
+            if item.item_type == item_name:
+                return item
+        return None
+
+    def get_items(self):
+        return self.buyable_items