Move this file to ..\SteamApps\common\Counter-Strike Global Offensive\csgo\cfg
after enter in game console - exec autoexec and you will see new available commands. You can change alias like you want,
for example, you can make 'cfg' alias for your settings.
Alias is a command that is used to give a command or a chain of commands a custom name. Look at it like creating your own console commands using existing commands. Bind - is the command that you use to link a console command to a key.
