update cncf declaration

Signed-off-by: lilai <lilai23@foxmail.com>

README-zh.md

@@ -19,11 +19,15 @@
 
 **Sermant**（也称之为Java-mesh）是基于Java字节码增强技术的无代理服务网格，其利用Java字节码增强技术为宿主应用程序提供服务治理功能，以解决大规模微服务体系结构中的服务治理问题。
 
-Sermant的愿景还包括构建插件开发生态系统，以帮助开发人员更容易地开发服务治理功能，同时不干扰业务代码。Sermant架构描述如下。
+Sermant的愿景还包括构建插件开发生态系统，以帮助开发人员更容易地开发服务治理功能，同时不干扰业务代码。
+
+<img src="docs/binary-docs/cncf-color.png" alt="pic" width="40%" />
+
+Sermant是云原生计算基金会（CNCF）的沙盒项目。如果您是一个希望在支持云原生生态系统的增长和发展方面发挥积极作用的组织，请考虑加入CNCF。
 
 ![pic](docs/binary-docs/sermant-product-arch.png)
 
-根据上图，Sermant中JavaAgent包含两层功能。
+Sermant架构描述如上，Sermant中JavaAgent包含两层功能。
 
 - 框架核心层。核心层提供Sermant的基本框架功能，以简化插件开发。该层的功能包括心跳、数据传输、动态配置等。
 - 插件服务层。插件为宿主应用提供实际的治理服务。开发者可以直接利用框架核心服务开发简单插件，也可以开发插件自身的复杂服务治理功能来开发复杂插件。

README.md

@@ -18,11 +18,15 @@
 
 **Sermant** (also known as Java-mesh) is a proxyless service mesh based on Java bytecode enhancement technology. It utilizes Java bytecode enhancement to provide service governance capabilities to applications, addressing service governance issues in large-scale microservices architectures. 
 
-Sermant's vision also includes building a plugin development ecosystem to assist developers in more easily creating service governance functionalities without interfering with the application's source code. The Sermant architecture is depicted as follows.
+Sermant's vision also includes building a plugin development ecosystem to assist developers in more easily creating service governance functionalities without interfering with the application's source code.
+
+<img src="docs/binary-docs/cncf-color.png" alt="pic" width="40%" />
+
+Sermant is a sandbox project of the Cloud Native Computing Foundation (CNCF). Please consider joining the CNCF if you are an organization that wants to take an active role in supporting the growth and evolution of the cloud native ecosystem.
 
 ![pic](docs/binary-docs/sermant-product-arch.png)
 
-As described above, Sermant's JavaAgent has two layers of functions.
+The Sermant architecture is depicted as above. Sermant's JavaAgent has two layers of functions.
 
 - Framework core layer. The core layer provides Sermant's basic framework capability, in order to ease the plugin development. The function of this layer includes heart beat, data transmit, dynamic configuration, etc.
 - Plugin service layer. The plugin provides actual governance service for the application. The developer can either develop simple plugin by directly leveraging framework core service, or can develop complex plugin by developing plugin's own complex service-governance function.