build: add windows build script

build.bat

@@ -0,0 +1,61 @@
+@CD 	    /d "%~dp0"
+@ECHO 	    OFF
+TITLE       ntfy-desktop : Build
+SETLOCAL    ENABLEDELAYEDEXPANSION
+MODE        con:cols=125 lines=120
+MODE        125,40
+GOTO        comment_end
+-----------------------------------------------------------------------------------------------------
+    ntfy-desktop build script for:
+        - windows
+        - linux
+        - macos
+-----------------------------------------------------------------------------------------------------
+:comment_end
+
+ECHO.
+
+:: -----------------------------------------------------------------------------------------------------
+::  define:     directories
+:: -----------------------------------------------------------------------------------------------------
+
+set dir_home=%~dp0
+
+:: -----------------------------------------------------------------------------------------------------
+::  define:     platforms
+:: -----------------------------------------------------------------------------------------------------
+
+set platformLinux=x64 arm64 armv7l
+set platformMac=x64 arm64
+set platformWin=x64 ia32 arm64
+
+for %%a in (%platformLinux%) do (
+    echo.
+    echo Building linux-%%a
+    CALL electron-packager . ntfy-electron --platform "linux" --arch "%%a" --icon "ntfy.png" --overwrite --ignore=^/build
+)
+
+for %%b in (%platformMac%) do (
+    echo.
+    echo Building darwin-%%b
+    CALL electron-packager . ntfy-electron --platform "darwin" --arch "%%b" --icon "ntfy.icns" --overwrite --ignore=^/build
+)
+
+for %%c in (%platformWin%) do (
+    echo.
+    echo Building windows-%%c
+    CALL electron-packager . ntfy-electron --platform "win32" --arch "%%c" --icon "ntfy.ico" --overwrite --ignore=^/build
+)
+
+goto :END
+
+:: -----------------------------------------------------------------------------------------------------
+::  end
+:: -----------------------------------------------------------------------------------------------------
+
+:END
+    echo.
+    echo Build Complete
+    timeout /t 5 /nobreak >nul
+    echo.
+Exit /B 0