Refine README and add logo && landscape (#12)

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

README.md

@@ -1,3 +1,5 @@
+<img src="/image/opensergo-logo.svg" alt="OpenSergo Logo" width="50%">
+
 # [OpenSergo Specification](./specification/en/README.md)
 
 [![License: Apache-2.0](https://img.shields.io/badge/license-Apache%202.0-blue.svg)](https://www.apache.org/licenses/LICENSE-2.0.txt)
@@ -7,15 +9,17 @@
 ## Overview
 
 OpenSergo is an open, language-agnostic cloud-native service governance specification that is close to business semantics.
-In the scenario of heterogeneous microservices system, enterprises can manage services in different languages and protocols with this unified specification. 
+In the scenario of heterogeneous microservices system, enterprises can manage services in different languages and protocols with this unified specification.
+
+![landscape](./specification/en/images/opensergo-landscape-en.jpg)
 
 ## Projects
 
 * [opensergo-specification](https://github.com/opensergo/opensergo-specification): defines the OpenSergo specification
-* [opensergo-proto](https://github.com/opensergo/opensergo-proto): the OpenSergo protocol that defines the conmunication between the client and dashboard
+* [opensergo-proto](https://github.com/opensergo/opensergo-proto): the OpenSergo protocol that defines the conmunication between the client and control plane
 * [opensergo-dashboard](https://github.com/opensergo/opensergo-dashboard): the unified dashboard to managing the heterogeneous microservices.
-* [opensergo-java](https://github.com/opensergo/opensergo-java): the java sdk that implement the OpenSergo specification
-* [opensergo-go](https://github.com/opensergo/opensergo-java): the go sdk that implement the OpenSergo specification
+* [opensergo-java](https://github.com/opensergo/opensergo-java): the Java SDK that implements the OpenSergo specification
+* [opensergo-go](https://github.com/opensergo/opensergo-go): the Go SDK that implements the OpenSergo specification
 
 ## Community
 

README.zh-Hans.md

@@ -1,11 +1,14 @@
-# [OpenSergo 规范](./specification/zh-Hans/README.md)
+<img src="/image/opensergo-logo.svg" alt="OpenSergo Logo" width="50%">
+
+# [OpenSergo 标准规范](./specification/zh-Hans/README.md)
 
 [![License: Apache-2.0](https://img.shields.io/badge/license-Apache%202.0-blue.svg)](https://www.apache.org/licenses/LICENSE-2.0.txt)
 
 [English](./README.md)
 
-OpenSergo是一套开放的、语言无关的、贴近业务语义的云原生服务治理规范。
-面向异构微服务体系的场景，让企业能够以一种统一的规范来管理不同语言、不同协议的服务。
+OpenSergo 是一套开放、通用的、面向分布式服务架构、覆盖全链路异构化生态的服务治理标准，基于业界服务治理场景与实践形成通用标准规范。OpenSergo 的最大特点就是**以统一的一套配置/DSL/协议定义服务治理规则，面向多语言异构化架构，做到全链路生态覆盖**。无论微服务的语言是 Java, Go, Node.js 还是其它语言，无论是标准微服务还是 Mesh 接入，从网关到微服务，从数据库到缓存，从服务注册发现到配置，开发者都可以通过同一套 OpenSergo CRD 标准配置针对每一层进行统一的治理管控，而无需关注各框架、语言的差异点，降低异构化、全链路服务治理管控的复杂度。
+
+![landscape](./specification/zh-Hans/images/opensergo-landscape-cn.jpg)
 
 ## 社区