feat: add typescript support

Author: dayze

index.d.ts

@@ -0,0 +1,13 @@
+declare module 'react-native-voip-push-notification' {
+    export type Events =
+    'notification' |
+    'register'|
+    'didLoadWithEvents';
+
+    export default class RNVoipPushNotification {
+        static addEventListener(type: Events, handler: (args: any) => void): void
+        static registerVoipToken(): void;
+        static onVoipNotificationCompleted(uuid: string): void;
+        static removeEventListener(type: Events): void
+    }
+}

package.json

@@ -3,6 +3,7 @@
   "version": "3.1.0",
   "description": "VoIP push notification on react-native",
   "main": "index.js",
+  "typings": "./index.d.ts",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1"
   },