Missing simple test

[martymcguire]

The Examples for asyncio on Read the Docs have a examples/asyncio_simpletest.py with some partial comments and no other content.

Indeed, the entire contents in that file in this repo since its creation are:

# SPDX-FileCopyrightText: 2017 Scott Shawcroft, written for Adafruit Industries
# SPDX-FileCopyrightText: Copyright (c) 2021 Dan Halbert for Adafruit Industries
#
# SPDX-License-Identifier: Unlicense

Would love an example to follow that doesn't require a whole PyPortal! :}

[dhalbert]

The guide has a lot of examples: https://learn.adafruit.com/cooperative-multitasking-in-circuitpython-with-asyncio. We should probably point to that.

[FoamyGuy]

resolved by #67