Add menu item "About" to "Help"

lib/main-menu.js

@@ -3,6 +3,7 @@ const BrowserWindow = electron.BrowserWindow
 const shell = electron.shell
 const ipc = electron.ipcMain
 const mainWindow = require('./main-window')
+const os = require('os')
 
 const macOS = process.platform === 'darwin'
 // const WIN = process.platform === 'win32'
@@ -411,6 +412,28 @@ const help = {
           click () { shell.openExternal('https://github.com/TobseF/boostnote-markdown-cheatsheet/blob/master/BOOSTNOTE_MARKDOWN_CHEAT_SHEET.md') }
         }
       ]
+    },
+    {
+      type: 'separator'
+    },
+    {
+      label: 'About',
+      click () {
+        const version = electron.app.getVersion()
+        const electronVersion = process.versions.electron
+        const chromeVersion = process.versions.chrome
+        const nodeVersion = process.versions.node
+        const v8Version = process.versions.v8
+        const OSInfo = `${os.type()} ${os.arch()} ${os.release()}`
+        const detail = `Version: ${version}\nElectron: ${electronVersion}\nChrome: ${chromeVersion}\nNode.js: ${nodeVersion}\nV8: ${v8Version}\nOS: ${OSInfo}`
+        electron.dialog.showMessageBox(BrowserWindow.getFocusedWindow(),
+          {
+            title: 'BoostNote',
+            message: 'BoostNote',
+            type: 'info',
+            detail: `\n${detail}`
+          })
+      }
     }
   ]
 }