Create README.md

Author: Evgenii

README.md

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+Android-ExpandIcon
+================
+
+Nice and simple customizable implementation of Google style up/down arrow.
+
+![image](https://github.com/zagum/Android-ExpandIcon/blob/master/art/expand_icon_demo.gif)
+
+Compatibility
+-------------
+
+This library is compatible from API 15 (Android 4.0.3).
+
+Download
+--------
+
+Add it in your root build.gradle at the end of repositories:
+
+```groovy
+allprojects {
+    repositories {
+        ...
+        maven { url "https://jitpack.io" }
+    }
+}
+```
+
+Add the dependency
+
+```groovy
+dependencies {
+    compile ''
+}
+```
+
+Usage
+-----
+
+Default implementation:
+
+```xml
+    <com.github.zagum.expandicon.ExpandIconView
+        android:layout_width="24dp"
+        android:layout_height="24dp"/>
+```
+
+Fully customized implementation:
+
+```xml
+    <com.github.zagum.expandicon.ExpandIconView
+        android:layout_width="24dp"
+        android:layout_height="24dp"
+        app:animationDuration="300"
+        app:color="#000"
+        app:colorLess="@color/colorPrimary"
+        app:colorMore="@color/colorAccent"
+        app:roundedCorners="false"
+        app:switchColor="true"/>
+```
+
+Public methods: 
+
+```java
+    expandIconView.switchState();
+    
+    expandIconView.setState(ExpandIconView.LESS, true);
+    
+    expandIconView.setFraction(.3f, true);
+```
+
+See sample project for more information
+
+License
+-------
+
+    Copyright 2016 Evgenii Zagumennyi
+    
+    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.