Add 6.2 install script for windows (#160)

This is for dockerless workflow

Author: award999

.github/workflows/scripts/windows/swift/install-swift-6.2.ps1

@@ -0,0 +1,17 @@
+##===----------------------------------------------------------------------===##
+##
+## This source file is part of the Swift.org open source project
+##
+## Copyright (c) 2025 Apple Inc. and the Swift project authors
+## Licensed under Apache License v2.0 with Runtime Library Exception
+##
+## See https://swift.org/LICENSE.txt for license information
+## See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+##
+##===----------------------------------------------------------------------===##
+. $PSScriptRoot\install-swift.ps1
+
+$SWIFT='https://download.swift.org/swift-6.2-release/windows10/swift-6.2-RELEASE/swift-6.2-RELEASE-windows10.exe'
+$SWIFT_SHA256='80FBBC17D4F9EDEC74A83ABBEFEB9FF418FFC2158CD347111583C45E47F9789B'
+
+Install-Swift -Url $SWIFT -Sha256 $SWIFT_SHA256