Added Start menu

src/freegames/snake.py

@@ -6,17 +6,39 @@
 2. How can you make the snake go around the edges?
 3. How would you move the food?
 4. Change the snake to respond to mouse clicks.
+5. How can you change the design of the start menu?
+6. How would you change the button required to start the game?
 """
 
 from random import randrange
 from turtle import *
-
 from freegames import square, vector
-
 food = vector(0, 0)
 snake = [vector(10, 0)]
 aim = vector(0, -10)
-
+game_started = False 
+"""Variable to determine game state, needed to prevent infinite loop"""
+
+def start_game():
+    """Clear the screen and start the game loop."""
+    global game_started
+    if game_started:
+        return 
+    game_started = True
+    clear() 
+    move()  
+
+def draw_start_screen():
+    """Draws the initial menu text."""
+    clear()
+    up()
+    goto(0, 50)
+    color('black')
+    write("SNAKE", align="center", font=("Courier", 30, "bold"))
+
+    goto(0, -50)
+    write("Press SPACE to Start", align="center", font=("Courier", 16, "normal"))
+    update()
 
 def change(x, y):
     """Change snake direction."""
@@ -66,5 +88,7 @@ def move():
 onkey(lambda: change(-10, 0), 'Left')
 onkey(lambda: change(0, 10), 'Up')
 onkey(lambda: change(0, -10), 'Down')
-move()
+"""Sets up start menu"""
+onkey(start_game, 'space')
+draw_start_screen()
 done()