Add Usage example to README for other inputs..

[slontis]

It might be nice to show how to use some of the other inputs that you allow setting (for github action newbies).
I am adding msvc-dev-cmd to openssl.

[ilammy]

Nice idea, @slontis. Thanks!

I've updated README to include some examples of usage with inputs.

Turns out that existing examples was even slightly incorrect 🤦

[slontis]

Thanks..