[Documentation] Could the main README or another subpage or linked-in page, show how to use localhost + .cgi or similar? #589

Hello there,

I have various old .cgi scripts I'd like to test automatically.

I don't know if ferrum can be used for this right now.

Would it be possible to add an example or comment, whether a file such as:

/opt/foo.cgi

written in ruby (cgi), could be tested by ferrum? On localhost? In other words,
whether localhost will work or not?

I will try anyway in a moment, but I wanted to ask this, whether it could be
documented explicitely, so that we, upon seeing this project here for the
first time, instantly know whether localhost is also supported, as-is.