Example for proc macro

[hellow554]

Your readme states:

This is particularly useful for proc macros

but yet there's no example for a proc macro.
I can understand that it would be overkill for the readme, but consider creating an examples directory and put it there for a full-fledged example.

[LukasKalbertodt]

Very good point! Thanks for reporting.

I just pushed some commits that add a proc-macro example to the README and also a full example in the examples/ directory. I guess this should be sufficient for now?

[hellow554]

Amazing! Thank you Lukas.