Added PowerShell script for downloading and combining ISO from Windows

[MilkshakesZA]

I'm a windows user, and my MacBook did not come with a working OS when i bought it, so I wrote the script so I could make the ISO from my daily machine, but I figured it may help someone else out with a similar niche problem to me.

Change:
Replicated iso.sh functionality in a PowerShell script.
Attempted to add the population of variables to the CI for this script as well, i used a sloppy copy paste of the existing replace, please scrutinize this in particular.

Test :
Script in operation:

Above output file was was burned using Balena and successfully installed on my 2019 MacBook pro

[AdityaGarg8]

Ah I was thinking of making something for windows. Thanks!

[AdityaGarg8]

I would prefer it to be in .cmd though since afaik Windows doesn't allow running random powershell scripts by default.