Add Swift interactive version with menu-driven UI

.gitignore

@@ -0,0 +1,21 @@
+# Compiled Swift binaries
+createinstalliso-interactive
+
+# macOS application bundles
+*.app
+
+# Swift build artifacts
+*.swiftmodule
+*.swiftdoc
+*.dSYM/
+
+# macOS system files
+.DS_Store
+.AppleDouble
+.LSOverride
+
+# Thumbnails
+._*
+
+# AppleScript compiled files (keep source)
+*.scpt

BUILD.md

@@ -0,0 +1,48 @@
+# Building the Interactive Swift Version
+
+## Quick Build
+
+```bash
+# Compile the binary
+swiftc -O createinstalliso-interactive.swift -o createinstalliso-interactive
+
+# Make executable
+chmod +x createinstalliso-interactive
+
+# Run it
+./createinstalliso-interactive
+```
+
+## Create Double-Clickable App (Optional)
+
+The repository includes `CreateInstallISO-Sudo.applescript` which creates a sudo-enabled app:
+
+```bash
+# Compile the AppleScript into an app bundle
+osacompile -o "CreateInstallISO Interactive.app" CreateInstallISO-Sudo.applescript
+```
+
+This app will:
+- Open Terminal automatically
+- Prompt for your password with sudo
+- Work with all installer types including Sierra 10.12+
+- Support the new "Write ISO to USB Drive" feature (option 7)
+
+## One-Liner
+
+```bash
+swiftc -O createinstalliso-interactive.swift -o createinstalliso-interactive && chmod +x createinstalliso-interactive && ./createinstalliso-interactive
+```
+
+## Requirements
+
+- macOS with Swift compiler (Xcode Command Line Tools)
+- Swift 5.0 or later
+
+## Notes
+
+- Compiled files are `.gitignore`d (not committed to repository)
+- Binary size: ~123KB
+- App bundle size: ~200KB
+
+See **README-SWIFT-INTERACTIVE.md** for complete documentation.

CreateInstallISO-Sudo.applescript

@@ -0,0 +1,11 @@
+#!/usr/bin/osascript
+on run
+    set scriptPath to POSIX path of (path to me)
+    set scriptDir to do shell script "dirname " & quoted form of scriptPath
+    set executablePath to scriptDir & "/createinstalliso-interactive"
+
+    tell application "Terminal"
+        activate
+        do script "cd " & quoted form of scriptDir & " && sudo " & quoted form of executablePath & "; echo ''; echo 'Press any key to close this window...'; read -n 1; exit"
+    end tell
+end run