Update README.md

README.md

@@ -2,3 +2,35 @@
 A library to add shadows for the Android View.(一个方便为Android View添加自然的阴影的库)
 
 ![demo.gif](https://github.com/zhengcx/ShadowHelper/blob/master/shadowhelper.gif)
+
+#How to use
+1.**Step 1:** Add the JitPack repository to your build file
+```gradle
+allprojects {
+		repositories {
+			...
+			maven { url 'https://jitpack.io' }
+		}
+	}
+```
+
+2.**Step 2:** Add the dependency
+```gradle
+dependencies {
+	        compile 'com.github.zhengcx:ShadowHelper:v1.0'
+	}
+```
+
+3.Use in Java code like this:
+```java
+ TextView textView1 = findViewById(R.id.tv_1);
+ ShadowConfig.Builder config = new ShadowConfig.Builder()
+                .setColor(mColor[0])//View颜色
+                .setShadowColor(mShadowColor)//阴影颜色
+                .setGradientColorArray(mColor)//如果View是渐变色，则设置color数组
+                .setRadius(mRadius)//圆角
+                .setOffsetX(mOffsetX)//横向偏移
+                .setOffsetY(mOffsetY);//纵向偏移
+
+ShadowHelper.setShadowBgForView(textView1, config);
+```