Add Local Notifications documentation guide

docs/localNotifications.md

+---
+id: localNotifications
+title: Local Notifications
+sidebar_label: Local Notifications
+---
+
+## <img src="https://upload.wikimedia.org/wikipedia/commons/thumb/f/fa/Apple_logo_black.svg/2000px-Apple_logo_black.svg.png" width=30/> iOS
+
+You can manually trigger local notifications in your JS code, to be posted immediately or in the future.
+Triggering local notifications is fully compatible with React Native `PushNotificationsIOS` library.
+
+Example:
+
+```javascript
+let localNotification = Notifications.postLocalNotification({
+	body: "Local notificiation!",
+	title: "Local Notification Title",
+	sound: "chime.aiff",
+    silent: false,
+	category: "SOME_CATEGORY",
+	userInfo: { }
+});
+```
+
+Notification object contains:
+
+- **`fireDate`**- The date and time when the system should deliver the notification (optinal - default is immidiate dispatch).
+- `body`- The message displayed in the notification alert.
+- `title`- The title of the notification, displayed in the notifications center.
+- `alertAction`- The "action" displayed beneath an actionable notification on the lockscreen (e.g. "Slide to **open**"). Note that Apple no longer shows this in iOS 10.
+- `sound`- The sound played when the notification is fired (optional -- will play default sound if unspecified). This must be the filename of a sound included in the application bundle; the sound must be 30 seconds or less and should be encoded with linear PCM or IMA4.
+- `silent`- Whether the notification sound should be suppressed (optional).
+- `category`- The category of this notification, required for [interactive notifications](#interactive--actionable-notifications-ios-only) (optional).
+- `userInfo`- An optional object containing additional notification data.
+
+### Cancel Scheduled Local Notifications
+
+The `Notifications.postLocalNotification()` method return unique `notificationId` values, which can be used in order to cancel specific local notifications that were scheduled for delivery on `fireDate` and have not yet been delivered. You can cancel local notification by calling `Notifications.cancelLocalNotification(notificationId)`.
+
+Example:
+
+```javascript
+let someLocalNotification = Notifications.postLocalNotification({
+	body: "Local notificiation!",
+	title: "Local Notification Title",
+	sound: "chime.aiff",
+	category: "SOME_CATEGORY",
+	userInfo: { }
+});
+
+Notifications.cancelLocalNotification(someLocalNotification);
+```
+
+To cancel all local notifications (**iOS only!**), use `cancelAllLocalNotifications()`:
+
+```javascript
+Notifications.ios.cancelAllLocalNotifications();
+```
+
+#### Cancel Delivered Local Notifications (iOS 10+ only)
+
+To dismiss notifications from the notification center that have already been shown to the user, call `Notifications.ios.removeDeliveredNotifications([notificationId])`:
+
+```javascript
+let someLocalNotification = Notifications.postLocalNotification({...});
+
+Notifications.ios.removeDeliveredNotifications([someLocalNotification]);
+```
+
+Call `removeAllDeliveredNotifications()` to dismiss all delivered notifications
+(note that this will dismiss push notifications in addition to local
+notifications).
+
+
+## <img src="https://upload.wikimedia.org/wikipedia/commons/thumb/a/a0/APK_format_icon.png/768px-APK_format_icon.png" width=30/> Android
+
+Much like on iOS, notifications can be triggered locally. The API to do so is a simplified version of the iOS equivalent that works more natually with the Android perception of push (remote) notifications:
+
+```javascript
+Notifications.postLocalNotification({
+	title: "Local notification",
+	body: "This notification was generated by the app!",
+	extra: "data"
+});
+```
+
+Upon notification opening (tapping by the device user), all data fields will be delivered as-is).

website/i18n/en.json

@@ -37,6 +37,10 @@
         "title": "iOS",
         "sidebar_label": "iOS specific"
       },
+      "localNotifications": {
+        "title": "Local Notifications",
+        "sidebar_label": "Local Notifications"
+      },
       "notification-object": {
         "title": "Notification object",
         "sidebar_label": "Notification"

website/sidebars.json

 {
   "docs": {
     "Installation": ["installation-ios", "installation-android"],
-    "Guides": ["subscription"],
+    "Guides": ["subscription", "localNotifications"],
     "Advanced": ["advanced-ios"]
   },
   "api": {