Add installer section descriptions

[xparadoxical]

Geode Version

2.0.0-beta.25

Related Problem

When installing Geode, I don't know if Visual Studio Runtime, steam_appid.txt and Resources are needed. I'm asked to make 3 decisions but the options aren't explained.

Your Solution

Add explanations of what these options are and what they're needed for / when they're needed to the installer.

Additional Information

There's a thread with a possible solution