Add support for notification actions on macOS

docs/api/notification.md

@@ -36,6 +36,7 @@ Returns `Boolean` - Whether or not desktop notifications are supported on the cu
   * `icon` [NativeImage](native-image.md) - (optional) An icon to use in the notification
   * `hasReply` Boolean - (optional) Whether or not to add an inline reply option to the notification.  _macOS_
   * `replyPlaceholder` String - (optional) The placeholder to write in the inline reply input field. _macOS_
+  * `actions` [NotificationAction[]](structures/notification-action.md) - Actions to add to the notification.  Please read the available actions and limitations in the `NotificationAction` documentation _macOS_
 
 
 ### Instance Events
@@ -83,6 +84,13 @@ Returns:
 
 Emitted when the user clicks the "Reply" button on a notification with `hasReply: true`.
 
+#### Event: 'action' _macOS_
+
+Returns:
+
+* `event` Event
+* `index` Number - The index of the action that was activated
+
 ### Instance Methods
 
 Objects created with `new Notification` have the following instance methods:

docs/api/structures/notification-action.md

@@ -0,0 +1,20 @@
+# NotificationAction Object
+
+* `type` String - The type of action, can be `button`.
+* `label` String - The label for the given action.
+
+## Platform / Action Support
+
+| Action Type | Platform Support | Limitations |
+|-------------|------------------|-------------|
+| `button`    | macOS            | Maximum of one button, if multiple are provided only the last is used |
+
+### Button support on macOS
+
+In order for extra notification buttons to work on macOS your app must meet the
+following criteria.
+
+* App is signed
+* App has it's `NSUserNotificationAlertStyle` set to `alert` in the `info.plist`.
+
+If either of these requirements are not met the button simply won't appear.