Add an example which uses the methods that use OnDiskBitmap

Author: lesamouraipourpre

examples/icons/Play_48x48_small.bmp

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+# SPDX-FileCopyrightText: 2021 Tim C for Adafruit Industries
+# SPDX-License-Identifier: MIT

examples/icons/Play_48x48_small.bmp.license

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+# SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries
+# SPDX-License-Identifier: MIT
+
+import board
+from adafruit_turtle import Color, turtle
+
+turtle = turtle(board.DISPLAY)
+
+# The purpose of this test is to check that the OnDiskBitmap usage is
+# working correctly: bgpic(), changeturtle() & stamp()
+
+# Make sure that the following file is copied to the CircuitPython drive
+ICON = "/icons/Play_48x48_small.bmp"
+turtle.bgpic(ICON)
+turtle.changeturtle(ICON)
+
+starsize = min(board.DISPLAY.width, board.DISPLAY.height) * 0.9  # 90% of screensize
+
+print("Turtle time! Lets draw a star")
+
+turtle.pencolor(Color.BLUE)
+turtle.setheading(90)
+
+turtle.penup()
+turtle.goto(-starsize / 2, 0)
+turtle.pendown()
+
+start = turtle.pos()
+while True:
+    turtle.forward(starsize)
+    turtle.stamp()
+    turtle.left(170)
+    if abs(turtle.pos() - start) < 1:
+        break
+
+while True:
+    pass