Update README.md

Author: iamSahdeep

README.md

@@ -1,8 +1,72 @@
-# flutter_visualizers
+# flutter_visualizers [![Pub](https://img.shields.io/pub/v/flutter_visualizers.svg?style=flat-square)](https://pub.dartlang.org/packages/flutter_visualizers)
 
-A new Flutter plugin.
+A Flutter plugin to Visualize the audio being played (only android).
 
-## Getting Started
+## Usage
+* Add this to your pubspec.yaml
+  ```
+  dependencies:
+  flutter_visualizers: ^0.0.1
+  
+  ```
+* Get package from Pub:
+
+  ```
+  flutter packages get
+  ```
+* Import it in your file
+
+  ```
+  import 'package:flutter_visualizers/flutter_visualizers.dart';
+  ```
+  
+## Example
+  * Firstly, get a audioSessionID from your native android Mediaplayer.
+    ```
+    player.getAudioSessionId()
+    ```
+  * Simply Include this code in ``` body ```
+    ```
+    new Visualizer(
+            builder: (BuildContext context, List<int> wave) {
+              return new CustomPaint(
+                painter: new LineVisualizer(
+                  waveData: wave,
+                  height: MediaQuery.of(context).size.height,
+                  width : MediaQuery.of(context).size.width,
+                  color: Colors.blueAccent,
+                ),
+                child: new Container(),
+              );
+            },
+            id: playerID,
+          )
+    ```
+    Here playerId is the AudioSessionId which id needed to initialize the Visualizer.
+    
+    See the Complete [Example](https://github.com/iamSahdeep/FlutterVisualizers/tree/master/example)
+
+### Credits
+   - [GautamChibde](https://github.com/GautamChibde) for awesome [Visualizers](https://github.com/GautamChibde/android-audio-visualizer) in Android from which I made this.
+   - [Matt Carroll](https://github.com/matthew-carroll) for this [UI](https://github.com/matthew-carroll/flutter_ui_challenge_music_player/blob/recording/lib/main.dart)
+
+## License
+
+    Copyright [2018] [Sahdeep Singh]
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+    
+### Getting Started with Flutter
 
 This project is a starting point for a Flutter
 [plug-in package](https://flutter.io/developing-packages/),