Add a simple install guide for Windows users

docs/getting_started_installation.md

@@ -1,7 +1,7 @@
 # Installation
 
-- On Windows there is no installer yet, so you have to follow all the steps below.
-- On Linux, you might want to check if an OpenMoHAA package is available with your package manager.
+- Windows users can check this [Quick install guide](getting_started_installation_windows.md).
+- Linux users may want to check if an OpenMoHAA package is available with the distribution's package manager.
 
 ## Requirements
 

docs/getting_started_installation_windows.md

@@ -0,0 +1,38 @@
+# Quick installation
+
+This guide assumes you installed **Medal of Honor: Allied Assault Warchest** from GOG, but it also works with CD or other versions.
+
+You can get it from [GOG here](https://www.gog.com/en/game/medal_of_honor_allied_assault_war_chest).
+
+## 1. Download
+
+Grab the latest `openmohaa-*-windows-x64.zip` from the [releases page](https://github.com/openmoh/openmohaa/releases).
+
+## 2. Find your game folder
+
+1. Right-click your **Medal of Honor - Allied Assault** desktop shortcut → **Properties**
+2. Then check the "**Start in**" field, that's your game folder.
+
+![Shortcut](screenshots/install_guide/windows_installation_shortcut.png)
+
+Alternatively, try one of these common locations:
+- C:\GOG Games\Medal of Honor - Allied Assault War Chest
+- C:\Program Files (x86)\EA Games\MOHAA
+- C:\Program Files\Origin Games\Medal of Honor Allied Assault Warchest
+- C:\Program Files\GOG Galaxy\Games\Medal of Honor - Allied Assault War Chest
+
+If not there, you'll need to search where you installed it.
+
+## 3. Install
+
+1. **Extract the .zip file** you downloaded into the game folder you found earlier.
+2. **Create desktop shortcuts** for these 3 files:
+    * `launch_openmohaa_base.x86_64.exe` - *Allied Assault*
+    * `launch_openmohaa_spearhead.x86_64.exe` - *Spearhead*
+    * `launch_openmohaa_breakthrough.x86_64.exe` - *Breakthrough*
+
+To do that, **right-click each file**, then choose **Send to → Desktop (create shortcut)**.
+
+![Send To](screenshots/install_guide/windows_installation_sendto.png)
+
+Now you can launch any version of the game directly from your desktop using OpenMoHAA.