Add more information about Portable installation

[LostOnTheLine]

Is your feature request related to a problem? Please describe.
The description says

How to use
Download the applicable installer or executable for your system.

But does not make it clear how to do this. For Most Portable versions you have a folder with all the controller files.

Describe the solution you'd like
Can you make a note that Open-Video-Downloader-X.X.X.exe is the Portable version & that it will create an open-video-downloader folder when it's run containing all the dependencies?

Describe alternatives you've considered
I can deal with it, but it wasn't obvious. I had someone who I had recommended this to a few months ago but I just found out never installed it because he wasn't sure how to do the portable version

Additional context
Add any other context or screenshots about the feature request here.
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