[Feature Request] Add standard `--help`/`-h` command line interface arguments

[IcePanorama]

Hi. Please considering adding the standard/GNU-style --help/-h command line arguments to pcsx-redux.

I'm sure you're probably already familiar with these, but for the sake of completeness, here's a description of what I mean from GNU themselves. In practice, this would output information similar to that which is contained here in your docs, but just in a command-line readable fashion.

I would not expect you all to be forced to follow each and every one of GNU's coding standards to the T (I know they have some very vocal detractors out there lol). In this specific case however, I think the usage of --help/-h is standard enough across the industry/FOSS-community that it's a convenient thing to have nonetheless.

Yes, we could just read the docs linked above, but it'd be nice to have that included with the program itself and easily accessible via a terminal (where we'd already be when trying to figure out command line arguments).

Thanks for considering this suggestion. All the best, -IP