Add Show option under the Window menu

Window > Show will reveal the mainWindow after it has been closed.

// FREEBIE

main.js

@@ -157,11 +157,15 @@ app.on('ready', function() {
     setInterval(function() { autoUpdater.checkForUpdates(); }, autoUpdaterInterval);
   }
 
+  createWindow();
+
   let template = require('./menu.js');
-  const menu = Menu.buildFromTemplate(template)
-  Menu.setApplicationMenu(menu)
+  template[3].submenu[3].click = function() {
+    mainWindow.show();
+  };
+  const menu = Menu.buildFromTemplate(template);
+  Menu.setApplicationMenu(menu);
 
-  createWindow();
 })
 
 app.on('before-quit', function() {

menu.js

@@ -137,6 +137,9 @@ if (process.platform === 'darwin') {
       label: 'Zoom',
       role: 'zoom'
     },
+    {
+      label: 'Show',
+    },
     {
       type: 'separator'
     },