Add licence file about resolve-pathname

[linde12]

@mjackson Can i help with this? resolve-pathname is an ancestral dependency which we would like to display a license for in our application.

Thanks

[r-tm]

Please add license file. We intend to use both resolve-pathname and value-equal commercially, but without legal risk.

[Eli-Black-Work]

We would also like to see this :)

[reverofevil]

@mjackson ping :)