update readme

Author: gavinliu

README_zh.md

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+# Android-ScaleLayout
+
+一个简单的,方便的多屏适配的Android库
+
+## 本质就是百分比缩放
+
+### 和 android-percent-support-lib 的不同
+
+1. **更科学**      
+    ``android-percent-support-lib`` 是父控件和子控件的百分比关系      
+    ``Android-ScaleLayout`` 是设计界面和设备界面的百分比关系      
+
+2. **更方便**
+    ``android-percent-support-lib`` 需要把设计尺寸算成百分比      
+    ``Android-ScaleLayout`` 直接把设计尺寸填入``layou.xml``即可      
+
+
+## How to look?
+
+![screenhot](/screenhot.png)
+
+
+## 原理
+
+```java
+float realPixel = percent * designPixel
+```
+
+### Pix Mode
+
+```java
+float realPixel = percent * designPixel
+
+float percent = mScreenWidth / designScreenWidth
+
+float designPixel = res.getDimensionPixelSize()
+```
+```java
+float realPixel = mScreenWidth * res.getDimensionPixelSize() / designScreenWidth
+```
+
+### DP Mode
+```java
+float realPixel = percent * designPixel
+
+float percent = mScreenWidth / designScreenWidth
+float designPixel = designDP * designDensity // dp to pixel
+
+float designDP = res.getDimensionPixelSize() / mDensity
+```
+```java
+float realPixel = (mScreenWidth * designDensity * getPixelSize()) / (designScreenWidth * mDensity)
+```
+
+## 使用
+
+### 0. 依赖
+
+```
+dependencies {
+    compile 'cn.gavinliu.android.lib:ScaleLayout:1.0.2'
+}
+```
+
+### 1. 初始化
+
+```java
+public class MyApplication extends Application {
+
+    @Override
+    public void onCreate() {
+        ScaleConfig.create(this,
+            1080, // Design Width
+            1920, // Design Height
+            3,    // Design Density
+            ScaleConfig.DIMENS_UNIT_DP);
+    }
+}
+```
+
+### 2. Scale***Layout
+
+只需要把 ``FrameLayout`` ``LinearLayout`` ``RelativeLayout`` 替换成 ``ScaleFrameLayout`` ``ScaleLinearLayout`` ``ScaleRelativeLayout``.
+
+### 3. Scale by width or height
+
+```xml
+<attr name="layout_scale_by" format="enum">
+    <enum name="width" value="0"/>
+    <enum name="height" value="1"/>
+</attr>
+```
+```xml
+app:layout_scale_by="width"
+```
+
+### 支持的属性
+
+```xml
+<attr name="android:layout_width"/>
+<attr name="android:layout_height"/>
+
+<attr name="android:layout_margin"/>
+<attr name="android:layout_marginLeft"/>
+<attr name="android:layout_marginTop"/>
+<attr name="android:layout_marginRight"/>
+<attr name="android:layout_marginBottom"/>
+<attr name="android:layout_marginStart"/>
+<attr name="android:layout_marginEnd"/>
+
+<attr name="android:padding"/>
+<attr name="android:paddingLeft"/>
+<attr name="android:paddingTop"/>
+<attr name="android:paddingRight"/>
+<attr name="android:paddingBottom"/>
+<attr name="android:paddingStart"/>
+<attr name="android:paddingEnd"/>
+```
+
+## License
+
+MIT