Added a merchant class and a talk_to method to interact with friendly entities

squirrelbattle/entities/friendly.py

@@ -0,0 +1,20 @@
+from ..interfaces import FriendlyEntity, Map
+
+class Merchant(FriendlyEntity) :
+    """
+    The class for merchants in the dungeon
+    """
+
+    inventory = list
+
+    def __init__(self, inventory : list):
+        super().__init__()
+        self.inventory = inventory
+
+    def talk_to(self, player : Player) -> None:
+        """
+        This function is used to open the merchant's inventory in a menu,
+        and allow the player to buy/sell objects
+        """
+        #TODO
+        

squirrelbattle/interfaces.py

@@ -435,4 +435,7 @@ class FriendlyEntity(Entity):
         super().__init__(*args, **kwargs)
         self.maxhealth = maxhealth
         self.health = maxhealth if health is None else health
+
+    def talk_to(self, player : Player) -> None:
+        #TODO