Add screenshots, a quick start and a trademark notice to the README

NOTICE.txt

@@ -8,6 +8,9 @@ and is not relicensed by this project's MIT license.
 
 Game assets are not included - see res/GET_ASSETS.txt.
 
+System Shock is a trademark of its respective owners. This is an unofficial
+fan project and is not affiliated with, endorsed by or supported by them.
+
 The Android build additionally bundles:
 
 - GL4ES (https://github.com/ptitSeb/gl4es), vendored and patched (see

README.md

@@ -17,6 +17,45 @@ button, stick direction and game hotkey can be assigned to a game action.
 Questshock runs entirely on the headset (tested on a Meta Quest 2) as a
 sideloaded Android app, and needs your own copy of the game data.
 
+> **Unofficial fan project.** Questshock is not affiliated with, endorsed by or
+> supported by the rights holders of System Shock. It contains no game data: you
+> need your own copy of System Shock: Enhanced Edition.
+
+## Screenshots
+
+<table>
+  <tr>
+    <td width="50%"><img src="res/screenshots/questshock_v0.5.3_001.jpg" alt="Exploring the station on the virtual screen"><br><sub>Exploring the station on the virtual screen</sub></td>
+    <td width="50%"><img src="res/screenshots/questshock_v0.5.3_003.jpg" alt="Reading an email - the laser pointer clicks like a mouse"><br><sub>Reading an email - the laser pointer clicks like a mouse</sub></td>
+  </tr>
+  <tr>
+    <td width="50%"><img src="res/screenshots/questshock_v0.5.3_005.jpg" alt="Cyberspace"><br><sub>Cyberspace</sub></td>
+    <td width="50%"><img src="res/screenshots/questshock_v0.5.3_006.jpg" alt="The game screen, the menu and the keyboard float independently"><br><sub>The game screen, the menu and the keyboard float independently</sub></td>
+  </tr>
+  <tr>
+    <td width="50%"><img src="res/screenshots/questshock_v0.5.3_007.jpg" alt="The VR menu"><br><sub>The VR menu</sub></td>
+    <td width="50%"><img src="res/screenshots/questshock_v0.5.3_008.jpg" alt="Assigning controller inputs to game actions"><br><sub>Assigning controller inputs to game actions</sub></td>
+  </tr>
+</table>
+
+[A short video](res/screenshots/questshock_v0.5.3_010.mp4) shows the game in use.
+
+## Quick start
+
+You need a Meta Quest (tested on a Quest 2) and your own copy of the game data.
+
+1. Get **System Shock: Enhanced Edition** (for example from
+   [gog.com](https://www.gog.com/)); see "3. Game assets" below.
+2. Download `questshock-<version>-android-arm64.apk` from the repository's
+   Releases page and sideload it onto the headset with
+   [SideQuest](https://sidequestvr.com/) or `adb install`.
+3. Launch it once. It creates `/sdcard/QuestShock/`. Copy your game's `res/data/`
+   and `res/sound/` folders into `/sdcard/QuestShock/res/`.
+4. Launch it again. The left controller's menu button opens the menu; the
+   default controls are in "5.1.1. Menu, controls and cheats" below.
+
+Section "5.1. Installing and playing" has the details.
+
 ## 1. Design principles
 
 - **Standalone-headset-only.** The game must run entirely on the headset
@@ -1015,6 +1054,10 @@ under the **GNU GPLv3** (see `engine/LICENSE`) - it is included unchanged
 and is *not* relicensed by this project's MIT license. Any build or
 distribution of the compiled engine must comply with the GPLv3.
 
+System Shock is a trademark of its respective owners. Questshock is an
+unofficial fan project and is not affiliated with, endorsed by or supported by
+them.
+
 The game assets extracted into `res/assets/ss_ee/` are proprietary,
 copyrighted game data owned by their respective rightsholders - they are
 never committed to this repository (see `.gitignore`) and must be