Add ability to create your own macro

[mtdjr]

I don't see a way to create our own macro, at least not one that is documented. Can that be added? if you create a repo with the source code, I'd be happy to contribute.

[gnawux]

+1

[gnawux]

I think this should be the source code: https://github.com/xiudi/Attiny85_vusb_pad_test/tree/master/Attiny85_Test2