Add Push Notifcations Example (#68)

push_notifcations/README.md

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+# push_notifcations
+
+Push notification app demo in Flutter
+
+## Getting Started
+
+This app works in versions >= Flutter 1.22 as it supports android embedding v2. Run flutter upgrade before running this app 
+This app can only work if connected with firebase. It uses these libraries which are required to enable push notifications:-
+Versions maybe be different you should check the latest packages from pub.dev
+firebase_analytics: ^6.0.1
+firebase_messaging: ^7.0.2
+firebase_core: ^0.5.0
+
+All the dependencies required to integrate Firebase project are added but you may need to update there versions.
+You need to create new firebase project on firebase console and add the google-services.json file in app folder of project
+
+Dependencies and plugins for Firebase messaging packages are already added and you may not need to change anything for this
+A few resources to get you started if this is your first Flutter project:
+
+- [Lab: Write your first Flutter app](https://flutter.dev/docs/get-started/codelab)
+- [Cookbook: Useful Flutter samples](https://flutter.dev/docs/cookbook)
+
+For help getting started with Flutter, view flutter's documentation
+[online documentation](https://flutter.dev/docs), which offers tutorials,
+samples, guidance on mobile development, and a full API reference.