outline cell on the image map to make is more clear

entities/gamemap.py

@@ -105,6 +105,7 @@ class BrSimMap():
     final_y= self.world_height * scale_y
     image = _Image.new('RGB', (final_x, final_y))
     draw = _ImageDraw.Draw(image)
+    outline= '#000000'
 
     for y in range(self.world_height):
       for x in range(self.world_width):
@@ -135,7 +136,7 @@ class BrSimMap():
         scaled_y_height= (y + 1) * scale_y
 
         draw.rectangle([scaled_x_coord, scaled_y_coord, scaled_x_width, scaled_y_height],
-          fill= pixel_color
+          fill= pixel_color, outline= outline
         )
     
     # debug