Add Windows build script

build.bat

@@ -0,0 +1,34 @@
+@echo off
+setlocal
+
+cd /d "%~dp0"
+
+if not exist ".venv\Scripts\python.exe" (
+    echo [1/4] Creation de l'environnement virtuel...
+    py -3 -m venv .venv
+    if errorlevel 1 goto :error
+)
+
+echo [2/4] Installation des dependances...
+".venv\Scripts\python.exe" -m pip install --upgrade pip
+if errorlevel 1 goto :error
+".venv\Scripts\python.exe" -m pip install -r requirements.txt -e .
+if errorlevel 1 goto :error
+
+echo [3/4] Nettoyage des anciens builds...
+if exist build rmdir /s /q build
+if exist dist rmdir /s /q dist
+if exist ai-typewriter.exe.spec del /q ai-typewriter.exe.spec
+
+echo [4/4] Compilation Windows one-file...
+".venv\Scripts\python.exe" -m PyInstaller --clean --onefile --paths src --name ai-typewriter.exe main.py
+if errorlevel 1 goto :error
+
+echo.
+echo Build termine : dist\ai-typewriter.exe
+exit /b 0
+
+:error
+echo.
+echo Build echoue.
+exit /b 1