Made the Snake Game!

Added Snake Game demo.

Day 21/food.py

@@ -0,0 +1,18 @@
+from turtle import Turtle
+import random
+
+
+class Food(Turtle):
+    def __init__(self):
+        super().__init__()
+        self.shape("circle")
+        self.penup()
+        self.shapesize(stretch_len=0.5, stretch_wid=0.5)
+        self.color("red")
+        self.speed("fastest")
+        self.refresh()
+
+    def refresh(self):
+        random_x = random.randint(-280, 280)
+        random_y = random.randint(-280, 255)
+        self.goto(random_x, random_y)