Update README

Author: yndu13

README-CN.md

@@ -13,7 +13,7 @@
 [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://github.com/aliyun/aliyun-openapi-net-sdk/blob/master/LICENSE)
 [![FOSSA Status](https://app.fossa.io/api/projects/git%2Bgithub.com%2Faliyun%2Faliyun-openapi-net-sdk.svg?type=shield)](https://app.fossa.io/projects/git%2Bgithub.com%2Faliyun%2Faliyun-openapi-net-sdk?ref=badge_shield)
 
-欢迎使用 Alibaba Cloud SDK for .NET ，让您不用复杂编程即可访问云服务器、云监控等多个阿里云服务。
+阿里云 V1.0 SDK 即将进入基础安全维护阶段，不再建议使用，建议使用 V2.0 SDK。
 
 ## 使用诊断
 

README.md

@@ -13,7 +13,7 @@ English | [简体中文](./README-CN.md)
 [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://github.com/aliyun/aliyun-openapi-net-sdk/blob/master/LICENSE)
 [![FOSSA Status](https://app.fossa.io/api/projects/git%2Bgithub.com%2Faliyun%2Faliyun-openapi-net-sdk.svg?type=shield)](https://app.fossa.io/projects/git%2Bgithub.com%2Faliyun%2Faliyun-openapi-net-sdk?ref=badge_shield)
 
-The Alibaba Cloud SDK for .NET allows you to access Alibaba Cloud services such as Elastic Compute Service (ECS), Server Load Balancer (SLB), CloudMonitor, etc. You can access Alibaba Cloud services without the need to handle API related tasks, such as signing and constructing your requests.
+The Alibaba Cloud V1.0 SDK will soon enter the Basic Security Maintenance phase and is no longer recommended for use. It is suggested to use the V2.0 SDK instead.
 
 ## Troubleshoot