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https://developer.valvesoftware.com/wiki/Steam_Web_API
literally 5 seconds with a Internet Search engine...
the output will include general profile info and also which game they play with name and the games appid and with that you can do other queries.
the link has the whole reference, should be enough material to play around with.
for a more direct measure, the web api basics are explained here:
https://partner.steamgames.com/doc/webapi_overview
Edit: Well, that was easy. I had been signed out of friends for absolutely no good reason. Had to click the friends list to even notice it, now it shows up just fine. Doh.
I've got bad news for you. The search engine refers to this post.