Add build_wasm script for windows

Author: ValorZard

ebiten-game/game/build_wasm.ps1

@@ -0,0 +1,12 @@
+# SPDX-FileCopyrightText: 2025 The Pion community <https://pion.ly>
+# SPDX-License-Identifier: MIT
+
+$Env:GOOS = 'js'
+$Env:GOARCH = 'wasm'
+go build -o game.wasm .
+Remove-Item Env:GOOS
+Remove-Item Env:GOARCH
+$goroot = go env GOROOT
+
+# Go 1.24 and newer
+cp $goroot\lib\wasm\wasm_exec.js .