added sprites and made them render as agents in visualisation

server.py

@@ -4,14 +4,11 @@ from mesa.visualization.ModularVisualization import ModularServer
 
 
 def player_representation(agent):
-    portrayal = {"Shape": "circle",
-                 "Filled": "true",
-                 "Layer": 0,
-                 "Color": "red",
-                 "r": 0.5}
+    portrayal = {"Shape": "sprites/hero.png",
+                 "Layer": 1}
     if agent.isBox:
-        portrayal["Color"] = "grey"
-        portrayal["Layer"] = 1
+        portrayal["Shape"] = "sprites/box.png"
+        portrayal["Layer"] = 0
     return portrayal
 
 grid = CanvasGrid(player_representation, 10, 10, 500, 500)