add windows launch script

launch.bat

@@ -0,0 +1,25 @@
+@echo off
+setlocal
+cd /d "%~dp0"
+
+echo Disco Reaper -- unified Windows launcher
+
+IF NOT EXIST "venv" (
+    echo Virtual environment not found. Creating...
+    python -m venv venv
+    IF ERRORLEVEL 1 (
+        echo Error: Failed to create virtual environment. Ensure Python is installed and added to PATH.
+        pause
+        exit /b 1
+    )
+    call venv\Scripts\activate.bat
+    IF EXIST "requirements.txt" (
+        echo Installing requirements...
+        python -m pip install --upgrade pip -q
+        pip install -r requirements.txt -q
+    )
+) ELSE (
+    call venv\Scripts\activate.bat
+)
+
+python disco-reaper.py %*