Add default exe locations for Windows

[ABevier]

I added a default exe location for Windows so I don't have to always set the environment variable. It'll be nice to work "out of the box" for windows users.

[palantirtech]

Thanks for your interest in palantir/docker-compose-rule, @ABevier! Before we can accept your pull request, you need to sign our contributor license agreement - just visit https://cla.palantir.com/ and follow the instructions. Once you sign, I'll automatically update this pull request.

[thommelutten]

Is there any update on this?