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examples/usb: Add README that points out the alternative usb modules.

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Signed-off-by: Angus Gratton <angus@redyak.com.au>
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Angus Gratton 2024-05-14 10:24:11 +10:00 committed by Damien George
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## USBDevice Examples
These are examples of how to use the low-level `machine.USBDevice` class to create custom
USB device functionality.
Alternatively, there are [usb driver modules in
micropython-lib](https://github.com/micropython/micropython-lib/tree/master/micropython/usb#readme)
which provide a simpler interface and more built-in functionality.
In this directory:
* `usb_dfu_device.py` implements the USB Device Firmware Update protocol.
* `usb_simple_device.py` implements a custom USB protocol, with a matching host
program to run on a PC.
See comments at the top of each Python file for more details.