Add windows readme.

Author: mtwebster

README_WINDOWS.md

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+# Mouse Damper for Windows
+
+Windows-native implementation of Mouse Damper.
+
+## System Requirements
+
+- Windows 7 or newer (32-bit or 64-bit)
+- No external dependencies required
+
+## Building from Source
+
+### Prerequisites
+
+1. MSYS2 - Download from https://www.msys2.org/
+2. Install MSYS2 and open **MSYS2 MINGW64** terminal
+3. Install build tools:
+   ```bash
+   pacman -Syu
+   pacman -S mingw-w64-x86_64-gcc mingw-w64-x86_64-meson mingw-w64-x86_64-ninja
+   ```
+
+### Build Steps
+
+```bash
+cd /d/dev/mouse-damper
+meson setup build
+ninja -C build
+```
+
+### Build Output
+
+Three executables are created in `build/src/`:
+- `mousedamper.exe` (~290KB) - Main daemon
+- `mousedamper-launch.exe` (~293KB) - Launcher with configuration support
+- `mousedamper-config.exe` (~308KB) - GUI configuration tool
+
+## Installation
+
+### Option 1: NSIS Installer (Recommended)
+
+If you have NSIS installed (https://nsis.sourceforge.io/):
+
+```bash
+makensis installer.nsi
+```
+
+This creates `mousedamper-setup.exe` which:
+- Installs to `C:\Program Files\MouseDamper\`
+- Creates Start Menu shortcuts
+- Registers in Programs and Features
+- Creates uninstaller
+
+### Option 2: Manual Installation
+
+1. **Create installation directory:**
+   ```
+   C:\Program Files\MouseDamper\
+   ```
+
+2. **Copy executables:**
+   ```
+   build\src\mousedamper.exe         → C:\Program Files\MouseDamper\
+   build\src\mousedamper-launch.exe  → C:\Program Files\MouseDamper\
+   build\src\mousedamper-config.exe  → C:\Program Files\MouseDamper\
+   ```
+
+3. **Create Start Menu shortcut (optional):**
+   - Right-click on `mousedamper-config.exe`
+   - Send to → Desktop (create shortcut)
+   - Move shortcut to: `%APPDATA%\Microsoft\Windows\Start Menu\Programs\`
+
+Settings are stored in: `%APPDATA%\mousedamper\config.ini`
+
+Example:
+```ini
+[MouseDamper]
+Enabled=1
+DeltaThreshold=100
+OverrideDoubleClickTime=0
+DoubleClickTimeOverride=400
+```
+
+### If installed with NSIS installer:
+1. Use "Uninstall Mouse Damper" from Start Menu, or
+2. Use Programs and Features in Control Panel
+
+### If installed manually:
+1. Stop the daemon: `taskkill /F /IM mousedamper.exe`
+2. Remove autostart (if enabled):
+   - Open Registry Editor (regedit)
+   - Navigate to: `HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run`
+   - Delete value: `MouseDamper`
+3. Delete installation directory: `C:\Program Files\MouseDamper\`
+4. Delete configuration (optional): `%APPDATA%\mousedamper\`
+
+## License
+
+GPL-3.0 - See COPYING file for details
+
+Copyright 2020 Michael Webster <miketwebster@gmail.com>