update README

Author: liyongchun

README.md

@@ -1,2 +1,49 @@
 # EmjioRatingView
 Rate library for Android，Using Emoji icon to interactive, with:  :) = Positive. :| = Neutral. :( = Negative
+
+The Android implementation of [Rating Version A](https://dribbble.com/shots/2211556-Rating-Version-A), designed by [Hoang Nguyen](https://dribbble.com/Hoanguyen).
+
+
+![](https://raw.githubusercontent.com/ioneday/EmjioRatingView/master/screenshot/ratingview.gif)
+
+## Quick start
+
+1) Add your `layout.xml`
+
+
+```java
+<com.yongchun.emjioratingview.RatingView
+        android:id="@+id/rating_view"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:layout_gravity="center" />
+```
+
+2) set `OnRateChangeListener`
+
+```java
+RatingView view = (RatingView) findViewById(R.id.rating_view);
+view.setOnRateChangeListener(new RatingView.OnRateChangeListener() {
+    @Override
+    public void onChanged(float ratio) {
+        DecimalFormat df = new DecimalFormat("0.0");
+        score.setText(df.format(ratio*5));
+    }
+});
+```
+
+###License
+>The MIT License (MIT)
+
+>Copyright (c) 2015 Dee
+
+>Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+>The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+