Add Steam

Hi, 

as you also support Applications, maybe support for Steam could be useful. Steam is a store like Google Play for Desktop Games and Software? 

Could be something similar to Google Play store: 

This Application is distributed on Steam, a platform for the distribution of games, provided by Valve Corporation USA. By virtue of being distributed via this app store, Valve collects usage and diagnostics data and share aggregate information with the Owner. More information on how to manage analysis settings can be found on <a href="https://store.steampowered.com/privacy_agreement/">this page</a>.

Personal Data collected: Usage Data.

Place of processing: USA – <a href="https://store.steampowered.com/privacy_agreement/">Privacy Policy</a>. Privacy Shield participant.

Note that this refers to Steam as marketplace and content distributor, not authentication service like O-Auth for websites.