added init script for windows

init_win.ps1

@@ -0,0 +1,33 @@
+# Define the project name (the same as name: in the pubspec.yaml file)
+Set-Variable project "flutter_zxing"
+
+# Define the versions to download
+Set-Variable zxing_version "1.4.0"
+
+# Define the paths to the directories where the files will be installed
+Set-Variable projectPath "../../$project"
+Set-Variable zxingPath "$projectPath/ios/Classes/src/zxing"
+
+# Create the download directory
+mkdir -p download
+Set-Location download
+
+# Download the zxing source code and unzip it
+Invoke-WebRequest -O "zxing-cpp-$zxing_version.zip" "https://github.com/nu-book/zxing-cpp/archive/refs/tags/v$zxing_version.zip"
+Expand-Archive "zxing-cpp-$zxing_version.zip"
+
+# remove zxing from project
+Remove-Item -R "$zxingPath"
+
+# create the zxing directory
+mkdir -p "$zxingPath"
+
+# copy zxing
+Copy-Item -R "zxing-cpp-$zxing_version/core/" "$zxingPath"
+
+# print success message for zxing
+Write-Output "ZXing $zxing_version has been successfully installed"
+
+# remove the downloaded files
+Set-Location ..
+Remove-Item -R download