information about oss sdk for c# v2.

Author: huiguangjun

README-CN.md

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 ## [README of English](https://github.com/aliyun/aliyun-oss-csharp-sdk/blob/master/README.md)
 
+## 关于 OSS SDK for C# V2
+> - OSS SDK for C# V2([alibabacloud-oss-csharp-sdk-v2](https://github.com/aliyun/alibabacloud-oss-csharp-sdk-v2)) 测试版已发布, 是对V1（aliyun-oss-csharp-sdk）代码库的重大改写。
+> - V2是一个全新的版本，简化了底层操作例如身份验证、自动请求重试及错误处理等；提供了灵活友好的参数配置以及丰富的高级接口，例如分页器、传输管理器等，全面提升了开发效率和体验。
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 ## 关于
  - 阿里云对象存储（Object Storage Service，OSS），是[阿里云](https://www.aliyun.com)对外提供的海量，安全，低成本，高可靠的云存储服务。
  - OSS C# SDK基于[OSS REST API](https://help.aliyun.com/document_detail/31948.html)构建。

README.md

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 ## [README of Chinese](https://github.com/aliyun/aliyun-oss-csharp-sdk/blob/master/README-CN.md)
 
+## About OSS SDK for C# V2
+> - OSS SDK for C# V2([alibabacloud-oss-csharp-sdk-v2](https://github.com/aliyun/alibabacloud-oss-csharp-sdk-v2)) beta version has been released, it is a major rewrite of OSS SDK for C# V1 (aliyun-oss-csharp-sdk).
+> - V2 simplifies underlying operations such as identification authentication, automatic retry of failed requests, and error handling. It provides flexible parameter configuration methods and rich advanced operations, such as paginator, transmission managers. This comprehensively improves development efficiency and experience.
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 ## About
  Alibaba Cloud Object Storage Service (OSS) is a cloud storage service provided by [Alibaba Cloud](https://www.aliyun.com), featuring massive capacity, security, a low cost, and high reliability.
  - The OSS C# SDK is built based on [OSS REST API](https://help.aliyun.com/document_detail/31948.html).