Add Electron GUI and packaging scripts

gui/electron/main.js

@@ -0,0 +1,28 @@
+const { app, BrowserWindow, ipcMain } = require('electron');
+const { spawn } = require('child_process');
+const path = require('path');
+
+function createWindow() {
+  const win = new BrowserWindow({
+    width: 800,
+    height: 600,
+    webPreferences: {
+      preload: path.join(__dirname, 'preload.js')
+    }
+  });
+  win.loadFile('index.html');
+}
+
+app.whenReady().then(createWindow);
+
+ipcMain.handle('run-quickstart', async () => {
+  return new Promise((resolve, reject) => {
+    const proc = spawn('voxvera', ['quickstart'], { stdio: 'inherit' });
+    proc.on('close', code => resolve(code));
+    proc.on('error', err => reject(err));
+  });
+});
+
+app.on('window-all-closed', () => {
+  if (process.platform !== 'darwin') app.quit();
+});