Document SteamOS living-room browser experience

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-# AeroCore Browser Releases
+# AeroCore Browser
 
-This repository provides public releases of AeroCore Browser for Linux x86_64 systems, including SteamOS and compatible distributions.
+AeroCore Browser is a living-room browser designed for players using SteamOS or
+a SteamOS-like gaming mode with a TV and game controller as their primary
+setup. It lets you stay on the sofa: after finishing a game, you can exit it
+with the controller, switch to the browser from Steam just like launching
+another game, and open streaming and video services on the big screen—without
+changing devices, picking up a mouse and keyboard, or searching for the TV
+remote.
+
+## Designed for the living room
+
+- **Readable on large screens:** Websites are responsively sized for TVs of
+  52 inches and above, keeping text and controls recognizable from the typical
+  distance between a TV and the sofa.
+- **Controller-first interaction:** Browser navigation maps to the habits and
+  muscle memory players already have from using a game controller in most
+  games, making it practical to browse and control web pages without a mouse
+  or keyboard.
+
+This repository provides public releases of AeroCore Browser for Linux x86_64
+systems, including SteamOS and compatible distributions. The primary audience
+is users running SteamOS or a SteamOS-like gaming mode.
 
 ## Install