After downloading the mod, use a program such as 7zip or WinRAR to extract the main folder of the mod.
Drop that folder into the mods folder which is supposed to be in the game's installation folder (don't know where that is? click here)
Installation Instructions
Place koroneName in mods
Place koroneIcon in mod_overrides
Create a mod_overrides folder in PAYDAY 2/assets if there isn't one already.
The installation instructions are in the readme.txt as well.
Please leave comments below if you encounter any issues.