add README.md

Author: oldratlee

README.md

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+Java Dns Cache Manipulator(DCM)
+=======================================
+
+包含2部分：
+
+- [Java Dns Cache Manipulator Library](library)  
+    通过代码直接设置`Java`的`DNS`（实际上设置的是`DNS Cache`），支持`JDK 6+`。
+- [Java Dns Cache Manipulator Tool](tool)  
+    用于修改/查看 运行中`JVM`进程的`DNS Cache`。

library/README.md

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-Java Dns Cache Manipulator(DCM)
-=========================
+Java Dns Cache Manipulator(DCM) Library
+=======================================
 
 [![Build Status](https://travis-ci.org/alibaba/java-dns-cache-manipulator.svg?branch=master)](https://travis-ci.org/alibaba/java-dns-cache-manipulator)
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