feat: adding water tiles

1/3 of free tiles are now water. water.png obviously is a prototype (it's ugly).

src/field.py

@@ -14,3 +14,4 @@ class Field:
     def draw(self, surface):
         self.tiles.draw(surface)
         self.tractor.draw(surface)
+

src/tile.py

@@ -20,6 +20,9 @@ class Tile(pygame.sprite.Sprite):
             vegetables = tractor_kb.query(pl.Expr("warzywo(Nazwa_warzywa)"))
             random_vegetable = vegetables[random.randint(0, len(vegetables)-1)]['Nazwa_warzywa']
             self.set_type(random_vegetable)
+        else:
+            if random.randint(1, 10) % 3 == 0:
+                self.set_type('water')
             else:
                 self.set_type('grass')
 
@@ -36,6 +39,8 @@ class Tile(pygame.sprite.Sprite):
         self.type = type
         if self.type == 'grass':
             image_path = "images/grass.png"
+        elif self.type == 'water':
+            image_path = "images/water.png"
         else:
             image_path = f"images/vegetables/{self.type}.png"
             if not os.path.exists(image_path):