add language link.

README.md

@@ -1,4 +1,4 @@
-# CAP 　　　　　　　　　　　　　　　　　　[中文](https://github.com/dotnetcore/CAP/blob/master/README.zh-cn.md)
+# CAP 　　　　　　　　　　　　　　　　　　　　　　[中文](https://github.com/dotnetcore/CAP/blob/master/README.zh-cn.md)
 [![Travis branch](https://img.shields.io/travis/dotnetcore/CAP/master.svg?label=travis-ci)](https://travis-ci.org/dotnetcore/CAP)
 [![AppVeyor](https://ci.appveyor.com/api/projects/status/4mpe0tbu7n126vyw?svg=true)](https://ci.appveyor.com/project/yuleyule66/cap)
 [![NuGet](https://img.shields.io/nuget/vpre/DotNetCore.CAP.svg)](https://www.nuget.org/packages/DotNetCore.CAP/)

README.zh-cn.md

@@ -1,4 +1,4 @@
-# CAP
+# CAP 　　　　　　　　　　　　　　　　　　　　　　[English](https://github.com/dotnetcore/CAP/blob/master/README.md)
 [![Travis branch](https://img.shields.io/travis/dotnetcore/CAP/master.svg?label=travis-ci)](https://travis-ci.org/dotnetcore/CAP)
 [![AppVeyor](https://ci.appveyor.com/api/projects/status/4mpe0tbu7n126vyw?svg=true)](https://ci.appveyor.com/project/yuleyule66/cap)
 [![NuGet](https://img.shields.io/nuget/vpre/DotNetCore.CAP.svg)](https://www.nuget.org/packages/DotNetCore.CAP/)