add a guide to keyboard shortcuts

docs/tutorial/shortcuts.md

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+# Keyboard Shortcuts
+
+> Configure local and global keyboard shortcuts
+
+## Global Shortcuts
+
+You can use the [globalShortcut] module to detect keyboard events even when
+the application does not have keyboard focus.
+
+```js
+const {app, globalShortcut} = require('electron')
+
+app.on('ready', () => {
+  globalShortcut.register('CommandOrControl+X', () => {
+    console.log('CommandOrControl+X is pressed')
+  })
+})
+```
+
+## Local Shortcuts
+
+You can use the [Menu] module to configure keyboard shortcuts that will
+be triggered only when the app is focused. To do so, specify an
+[`accelerator`] property when creating a [MenuItem].
+
+```js
+const {Menu, MenuItem} = require('electron')
+const menu = new Menu()
+
+menu.append(new MenuItem({
+  label: 'Print',
+  accelerator: 'CmdOrCtrl+P'
+  click: () => { console.log('time to print stuff') }
+}))
+```
+
+It's easy to configure different key combinations based on the user's operating system.
+
+```js
+{
+  accelerator: process.platform === 'darwin' ? 'Alt+Cmd+I' : 'Ctrl+Shift+I'
+}
+```
+
+
+## Local Shortcuts without a Menu
+
+If you want to configure a local keyboard shortcut to trigger an action that
+_does not_ have a corresponding menu item, you can use the
+[electron-localshortcut] npm module.
+
+If you want to handle keyboard shortcuts for a [BrowserWindow], you can use the `keyup` and `keydown` event listeners on the window object inside the renderer process.
+
+```js
+window.addEventListener('keyup', doSomething, true)
+```
+
+Note the third parameter `true` which means the listener will always receive key presses before other listeners so they can't have `stopPropagation()` called on them.
+
+[Menu]: ../api/menu.md
+[MenuItem]: ../api/menu-item.md
+[globalShortcut]: ../api/global-shortcut.md
+[`accelerator`]: ../api/accelerator.md
+[electron-localshortcut]: http://ghub.io/electron-localshortcut
+[BrowserWindow]: ../api/browser-window.md