How do I let someone see the site ?

I guess you’re working on Windows…

I know that, on Macs, this app does that: https://clickontyler.com/virtualhostx/

You will have to look for a application that allow you the use one of these:
dyndns.com
easydns.com

Yes, Windows 7 – There must be some kind of cloud solution somewhere ??

Well, what do you want to do?
To show the site running in your machine?

Cloud solution would be a web hosting service, no?

Create static html using WP Super Cache plugin and upload to web hosting service.

open xampp look for file named xammp.httpd Been a while since I,ve done this if I am correct it is a subfolder /return in htdocs.Open the file in notepad and scroll down to Allow:127.0.0.1/8 change this to Allow:Your lan ip address/8
and no don’t change 8 to 80.
Or you could go for a free dns for the duration