Fix platform interface readme (#429)

* fix link to repo for platform interface

* add readme for platform interface

* add readme for the repository

README.md

@@ -0,0 +1,5 @@
+# flutter_local_notifications
+A Flutter plugin for displaying local notifications on Android and iOS. The repository consists of the following folders
+
+- flutter_local_notifications: code for the plugin
+- flutter_local_notifications: the code for common platform interface

flutter_local_notifications_platform_interface/CHANGELOG.md

@@ -1,3 +1,7 @@
+## [1.0.0+1]
+* Fix link to repo in pubspec
+* Update readme
+
 ## [1.0.0]
 
 * Initial release of platform interface

flutter_local_notifications_platform_interface/README.md

@@ -1,14 +1,7 @@
 # flutter_local_notifications_platform_interface
 
-A new Flutter package project.
+A common platform interface for the [`flutter_local_notifications`](https://pub.dev/packages/flutter_local_notifications) plugin.
 
-## Getting Started
+## Usage
 
-This project is a starting point for a Dart
-[package](https://flutter.dev/developing-packages/),
-a library module containing code that can be shared easily across
-multiple Flutter or Dart projects.
-
-For help getting started with Flutter, view our 
-[online documentation](https://flutter.dev/docs), which offers tutorials, 
-samples, guidance on mobile development, and a full API reference.
+Platform-specific implementations should extend from the `FlutterLocalNotificationsPlatform` class. Upon registering the plugin, the default implementation `FlutterLocalNotificationsPlatform` can be set by calling `FlutterLocalNotificationsPlatform.instance = MyFlutterLocalNotificationsPlatform()` where `MyFlutterLocalNotificationsPlatform()` represents the platform-specific implementation.

flutter_local_notifications_platform_interface/pubspec.yaml

@@ -1,7 +1,7 @@
 name: flutter_local_notifications_platform_interface
 description: A common platform interface for the flutter_local_notifications plugin.
-version: 1.0.0
-homepage: https://github.com/MaikuB/flutter_local_notifications/flutter_local_notifications_platform_interface
+version: 1.0.0+1
+homepage: https://github.com/MaikuB/flutter_local_notifications/tree/master/flutter_local_notifications_platform_interface
 
 environment:
   sdk: ">=2.1.0 <3.0.0"