Add install section, project disclaimer, and scope to README

Author: LavaToaster

README.md

@@ -9,6 +9,15 @@
   Primarily built for <strong>Apple TV</strong>, with <strong>macOS</strong> support.
 </p>
 
+<p align="center">
+  <em>ImmichLens is an independent project and is not affiliated with or endorsed by the Immich team.</em>
+</p>
+
+<p align="center">
+  This is not a full Immich client — it's a <strong>lens</strong> into your library.<br>
+  The goal is a beautiful, read-only viewing experience, not 1-to-1 feature parity.
+</p>
+
 <p align="center">
   <a href="https://testflight.apple.com/join/azBvZQCs"><img src="https://img.shields.io/badge/TestFlight-Join%20Beta-0D96F6?logo=apple&logoColor=white" alt="Join TestFlight Beta"></a>
   <img src="https://img.shields.io/badge/platform-macOS%2026.0%2B-blue" alt="macOS 26.0+">
@@ -18,6 +27,12 @@
 
 ---
 
+## Install
+
+**Apple TV (tvOS)** — Install via [TestFlight](https://testflight.apple.com/join/azBvZQCs). Open the link on your iPhone or iPad signed into the same Apple Account as your Apple TV, then accept the invite — the app will appear on your Apple TV automatically.
+
+**macOS** — Download the latest `.dmg` from [GitHub Releases](https://github.com/LavaToaster/immich-lens/releases).
+
 ## Screenshots
 
 <p align="center">