wip: packaging + scripts before archive into OpenKKnD

packaging/windows-msi/README.md

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+# Windows MSI (7 / 8 / 10)
+
+## Intent
+
+Ship `openkknd.exe` + SDL2 DLLs via **WiX** MSI.
+
+## Cross-build from macOS
+
+Not fully automated on firecuda yet. Options:
+
+1. CI on Windows runners (GitHub Actions) building with MSVC or MinGW + WiX.
+2. MinGW-w64 cross toolchain + `makensis` / WiX on Linux CI.
+
+## Local script placeholder
+
+`build-msi.ps1` (to be added) should:
+
+- build Release with CMake + VS or MinGW
+- harvest files with heat/candle/light
+- produce `OpenKKND-<version>-win.msi`
+
+Target OS: Windows 7 SP1+, 8, 10 (avoid APIs newer than Win7 for the baseline binary).