Update documentation to include the video showing the app features

Author: Titouan Thibaud

.gitignore

@@ -16,6 +16,7 @@
 .externalNativeBuild
 .cxx
 local.properties
+/temp-doc
 
 # Compiled python code
 *.pyc

README.md

@@ -1,9 +1,34 @@
-# Fenix Installer
+<p align="center">
+  <img src="app/src/main/res/mipmap-xxxhdpi/ic_launcher_foreground.webp" alt="TryFox icon" width="220" />
+</p>
+
+<h1>TryFox</h1>
 
 A simple Android app to search, download, and install Fenix (Firefox for Android), Focus, and other Mozilla Android project APKs from CI builds.
 
+## Install TryFox
+
+Install the latest APK from [TryFox Releases](https://github.com/mozilla-mobile/TryFox/releases/latest).
+
+To make TryFox handle Treeherder links on Android:
+
+1. Install TryFox an
+2. Open Android `Settings`.
+3. Go to `Apps` or `Applications`.
+3. Select `TryFox`.
+4. Open `Open by default`.
+5. Tap `Supported web addresses` or `Add link`.
+6. Enable `treeherder.mozilla.org`.
+7. If your device shows an `Open supported links` toggle or menu, set it to `Open in this app`.
+
+After that, opening a Treeherder URL such as `https://treeherder.mozilla.org/jobs?repo=try&revision=<REVISION>` should offer or directly open TryFox, depending on your Android version and current default-browser settings.
+
 ## Features
 
+<video src="doc/tryfox-demo-jan-2026.mp4" controls muted playsinline width="720">
+  Your browser does not support the video tag.
+</video>
+
 -   **Multi-Project Support**: Select from projects:
     -   `try` (default)
     -   `mozilla-central` (displayed as "central")
@@ -65,6 +90,18 @@ A simple Android app to search, download, and install Fenix (Firefox for Android
 ./gradlew assembleDebug
 ```
 
+Run unit tests:
+
+```bash
+./gradlew testDebugUnitTest
+```
+
+Run Android instrumentation tests with a connected device or running emulator:
+
+```bash
+./gradlew connectedDebugAndroidTest
+```
+
 ## Architecture
 
 -   **Jetpack Compose** for UI (Material 3 theming).