Add option to automatically add .foreman/bin to the PATH

[ghostnaps]

It has been a high point of friction getting other lua engineers onboarded with Foreman due to the manual process of updating their PATH to include the bin folder.

In particular, it is cumbersome to have to provide Windows and MacOS specific instructions any time I want to include Foreman in a project due to the varying ways of configuring the user's PATH. I have personally had a lot of trouble in the past figuring out just how to setup MacOS with the zsh shell so that it knows where the bin folder is.

It would be great if the PATH could be configured automatically so that my team can have a frictionless experience when installing tools managed by Foreman. Our lives would be a lot easier if this were the case.