Update README.md

Author: aminyazdanpanah

README.md

@@ -1,20 +1,49 @@
+# Google Maps Android 3D Pie Chart Marker Clustering Java.
+
 [![Android Arsenal](https://img.shields.io/badge/Android%20Arsenal-Google%20Maps%20Android%203D%20Pie%20Chart-brightgreen.svg?style=flat)](https://android-arsenal.com/details/1/5748)
 [![Build Status](https://travis-ci.org/aminyazdanpanah/google-maps-3D-pie-chart-marker-clustering-java.svg?branch=master)](https://travis-ci.org/aminyazdanpanah/google-maps-3D-pie-chart-marker-clustering-java)
 [![API](https://img.shields.io/badge/API-15%2B-brightgreen.svg?style=flat)](https://android-arsenal.com/api?level=15)
 [![](https://jitpack.io/v/aminyazdanpanah/google-maps-3D-pie-chart-marker-clustering-java.svg)](https://jitpack.io/#aminyazdanpanah/google-maps-3D-pie-chart-marker-clustering-java)
 [![Coverage Status](https://coveralls.io/repos/github/aminyazdanpanah/google-maps-3D-pie-chart-marker-clustering-java/badge.svg?branch=master)](https://coveralls.io/github/aminyazdanpanah/google-maps-3D-pie-chart-marker-clustering-java?branch=master)
 
-# Google Maps Android 3D Pie Chart Marker Clustering Java.
 
 This open-source library for marker clustering that has a beautiful 3D Pie chart for clustering which can useful for statical region.
 
 
-- **Marker clustering** — display 3D pie chart for clustering
-- **Marker clustering** — display bar chart clustering
+- **Display 3D pie chart for clustering**
+- **Display bar chart for clustering**
+
+## Demo
 
 ![Demo](/doc/demo.gif?raw=true "Demo")
 
-Please replace the Api key with your own in [Manifest.xml][manifest]. For more information, check out [my website][my-website].
+## Installation
+Before build the demo, you should get an [API] [API] key and replace in [AndroidManifest.xml][manifest].After that clone it and build it.That's it! 
+
+# Developed By
+
+* [Amin Yazdanpanah](http://www.aminyazdanpanah.com) 
+
+
+# License
+
+    Copyright 2017 Amin Yazdanpanah
+
+    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. 
+
+
+For more information, check out [my website][my-website].
 
 [my-website]: http://www.aminyazdanpanah.com 
 [manifest]: https://github.com/aminyazdanpanah/google-maps-3D-pie-chart-marker-clustering-java/blob/master/demo/src/main/AndroidManifest.xml#L39
+[API]:https://developers.google.com/maps/documentation/android-api/signup