Added a build script

build.ps1

@@ -0,0 +1,23 @@
+#!/usr/bin/env pwsh
+
+. ".\common.ps1"
+
+$game_name = $env:GAME_NAME ?? "game"
+
+New-Item -ItemType Directory -Force -Path "./build/" | Out-Null
+tar -cf "./build/$game_name.tar" -C $(Resolve-Path "./game/") *
+
+$output = "./build/$game_name.exe"
+[System.IO.File]::Copy("./lovedos/love.exe", $output, $true)
+Add-Content $output -AsByteStream -Value $(Get-Content -Raw -AsByteStream $(Resolve-Path "./build/$game_name.tar"))
+try {
+    $stream = $(Get-Item $output).Open([System.IO.FileMode]::Append)
+    $writer = [System.IO.BinaryWriter]::new($stream)
+
+    $tar = Get-Item "./build/$game_name.tar"
+    $writer.Write([Char[]] ('T', 'A', 'R', 0))
+    $writer.Write([Int32] ($tar.Length + 8))
+} finally {
+    $writer.Dispose()
+    $stream.Dispose()
+}