Add guide for setting up windows path variable

[VerinSenpai]

Just as the title says. First time doc contributor so I'm very very uncertain I've done this right. Also wasn't sure what a good reference point would be for this. Hopefully not a whole botch job.

Lastly, wasn't sure how to test how this would look on the site. Forgive my sins ;(

Adds a detailed walk-through for adding python and git to path (on windows).
Quite a few times I've seen people have difficulties with python because it wasn't in path so the scripts weren't executing right. And today I helped someone get git in path because that was also causing an issue. RUN_THIS.py checks git is installed but doesn't check that its invokable apparently. Another issue that should probably be solved as well.

[RemFexxel]

I read through your tutorial and changes and created a few comments.

One big issue is that I cannot see your images in the tutorial, which I suspect is due to an incorrect path. Another is that you've unnecessarily split your text into multiple lines instead of putting it on one line.

If I'm wrong about anything, let me know and dismiss my comments.

[VerinSenpai]

I have committed the changes. I borked the images when I first uploaded em cause I pasted into paint.net and then copied and pasted into rider, which for some reason didn't create proper png files :godo:

I've also combined the lines you suggested though I honestly feel its a bit scrunched up and lines are massive now in rider. Unless I was supposed to just remove the extra new-line.

[Centronias]

I hate to shoot you down, Verin, but isn't this something where directing somebody to google is enough?
imo SS14 docs should be docs about, well, SS14 and things particular to it.

[PJB3005]

Wouldn't it be easier to just tell them to re-run teh installer and actually click the checkbox this time?

[VerinSenpai]

Fair points. This was a learning opportunity nonetheless.