Fix README rendering

Author: evaherrada

README.rst

@@ -23,7 +23,23 @@ Only certain types of bitmaps work with this library, and they often have to be
 Usage Example
 =============
 
-.. literalinclude:: ../examples/imageload_simpletest.py
+.. code-block:: python
+
+    import board
+    import displayio
+    import adafruit_imageload
+
+    image, palette = adafruit_imageload.load(
+        "images/4bit.bmp", bitmap=displayio.Bitmap, palette=displayio.Palette
+    )
+    tile_grid = displayio.TileGrid(image, pixel_shader=palette)
+
+    group = displayio.Group()
+    group.append(tile_grid)
+    board.DISPLAY.show(group)
+
+    while True:
+        pass
 
 Contributing
 ============