docs(readme): add how to use in readme

Author: simpleton

README.md

@@ -3,7 +3,21 @@
 [ ![Download](https://api.bintray.com/packages/simsun/maven/tinkerpatch-android-sdk/images/download.svg) ](https://bintray.com/simsun/maven/tinkerpatch-android-sdk/_latestVersion)
 [![Join Slack](https://slack.tinkerpatch.com/badge.svg)](https://slack.tinkerpatch.com)
 
-集成[AndResGuard](https://github.com/shwenzhang/AndResGuard)例子，可以直接copy 'andresguard.gradle'到您的项目中。
+集成[AndResGuard](https://github.com/shwenzhang/AndResGuard)的例子。
 
+只需copy`andresguard.gradle`到你的工程中，并在`tinkerpatch.gradle`文件中增加如下代码:
+```gradle
+/**
+ * 引入 AndResGuard的相关配置
+ */
+project.ext {
+    TP_BAKPATH = bakPath
+    TP_BASEINFO = baseInfo
+    TP_VARIANTNAME = variantName
+}
+apply from: 'andresguard.gradle'
+```
+
+如果你开启资源混淆，备份文件夹中会多出`*-resource_mapping.txt`和`-andresguard.apk`文件。带有后缀`-andresguard`为资源混淆过的安装包。
 
 [更多集成文档](http://tinkerpatch.com/Docs/intro)