If you want to be easy accessible on Steam, you need to set up a custom URL. This is quite easy and can be done on your profile page here: https://steamcommunity.com/id/me/edit.
After that, use the name you enter for your custom URL as your username. Now people can go straight to your profile and add you as a friend.
Call of Duty: Infinite Warfare is a first-person shooter video game developed by Infinity Ward and published by Activision. It is the thirteenth primary installment in the Call of Duty series and was released for Microsoft Windows, PlayStation 4, and Xbox One on November 4, 2016.
Development of Infinite Warfare began during 2014. It is the first title by Infinity Ward under the new three-year development cycle for the Call of Duty series. The game's campaign is centered around a battle for the Solar System, which the Settlement Defense Front (SDF), a hostile force who are the main antagonists, are attempting to take over. The player takes control of Captain Nick Reyes of the Special Combat Air Recon (SCAR). They have their own transforming fighter, named "Jackal", that they can customize as well as a central hub world named Retribution.