update readme

Author: ToDou

README.md

@@ -1 +1,59 @@
 # shadow
+
+[Download Smaple]()
+
+Screenshot
+====
+![](/screenshot/bottom_radius.jpg)
+![](/screenshot/change_shadow_color.jpg)
+![](/screenshot/shadow_foreground_change.gif)
+![](/screenshot/with_no_top_shadow.jpg)
+
+Installation
+====
+```groovy
+dependencies {
+    compile 'com.loopeer.lib:shadow:0.0.1'
+}
+```
+Usages
+====
+```xml
+
+    <com.loopeer.shadow.ShadowView
+        android:id="@+id/shadow_view"
+        android:elevation="10dp"
+        android:padding="10dp"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_margin="12dp"
+        app:shadowMargin="20dp"
+        app:shadowRadius="14dp"
+        app:cornerRadius="4dp"
+        android:foreground="?attr/selectableItemBackground"
+        android:onClick="onShadowClickTest">
+
+        <TextView
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="Google Developer Days Europe 2017 took place in Krakow, Poland. In this playlist, you can find all the recorded sessions from the event, across all tracks (Develop on Mobile, Mobile Web, Beyond Mobile, and Android)."/>
+    </com.loopeer.shadow.ShadowView>
+```
+
+License
+====
+<pre>
+Copyright 2017 Loopeer
+
+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.
+</pre>