there is some basic info in the wiki about joining a server. (on windows if you want to connect to a local server, connect to the ip 127.0.0.1)
There is no documentation at the moment because its not ready (but I’ve just updated it with the above info)
the config is written in your appdata because nowadays, computers are multi user, so you don’t want your settings be mixed up with other users their settings
coopconfig.cfg is always overwritten, the same counts for wolfconfig.cfg and wolfconfig_mp.cfg
if you want to make your own config, put it in the main folder and make an autoexec.cfg where you execute your new config
have fun