Update readme for beta release. (#1191)

* New english readme.

* New chinese readme.

README.md

@@ -5,7 +5,6 @@ Apache SkyWalking | [中文](README_ZH.md)
 
 **SkyWalking**: APM (application performance monitor) tool for distributed systems, especially designed for 
 microservices, cloud native and container-based (Docker, Kubernetes, Mesos) architectures.
-Underlying technology is a distributed tracing system.
 
 [![GitHub stars](https://img.shields.io/github/stars/apache/incubator-skywalking.svg?style=for-the-badge&label=Stars&logo=github)](https://github.com/apache/incubator-skywalking)
 [![Twitter Follow](https://img.shields.io/twitter/follow/asfskywalking.svg?style=for-the-badge&label=Follow&logo=twitter)](https://twitter.com/AsfSkyWalking)
@@ -16,19 +15,35 @@ Underlying technology is a distributed tracing system.
 [![Join the chat at https://gitter.im/sky-walking/Lobby](https://badges.gitter.im/openskywalking/Lobby.svg)](https://gitter.im/openskywalking/Lobby)
 [![OpenTracing-1.x Badge](https://img.shields.io/badge/OpenTracing--1.x-enabled-blue.svg)](http://opentracing.io)
 
-* Provide Java agent, **no need to CHANGE any application source code**.
-  * High performance agent. 
-  * [Supported middlewares, frameworks and libraries](docs/Supported-list.md).
-* Manual instrumentation
-  * As an [OpenTracing supported tracer](http://opentracing.io/documentation/pages/supported-tracers)
-  * Use **@Trace** annotation for any methods you want to trace.
-  * Integrate traceId into logs for log4j, log4j2 and logback.
-* Pure Java server implementation, provide RESTful and gRPC services. Compatibility with other language agents/SDKs. 
-* Community Agents/SDKs
-  * [.NET Core](https://github.com/OpenSkywalking/skywalking-netcore)
+# Abstract
+**SkyWalking** started as a distributed system in 2015. From 5.x, it evolved to the fully functional [Application Performance Management](https://en.wikipedia.org/wiki/Application_performance_management) 
+system. It is used for tracing, monitoring, diagnose distributed systems, especially based on microservices, cloud native and container,
+including:
+- Distributed tracing and context propagation
+- Application, instance, service metrics analysis
+- Root cause analysis
+- Application topology map analysis
+- Application and service dependency analysis
+- Slow service detected
+- Performance optimization
+
+# Core features
+- Multiple languages instrumentation agent or libraries 
+  - Native Java auto instrumentation agent. Trace and monitor your cluster without changing any source codes
+  - Community instrumentation agent or libraries
+    * [.NET Core](https://github.com/OpenSkywalking/skywalking-netcore) 
+    * [Node.js](https://github.com/OpenSkywalking/skywalking-nodejs)
+- Multiple storage backends: ElasticSearch, H2
+- [OpenTracing](http://opentracing.io/) compatible
+  - Native Java auto instrumentation agent could work with OpenTracing APIs in the same context
+- Lightweight and powerful backend aggregation and analysis capabilities
+- Modern and cool Web UI
+- Log integration
+- Alarm for slow or unstable(low SLA) application, instance and service 
 
 # Document
-[![EN doc](https://img.shields.io/badge/document-English-blue.svg)](docs/README.md) [![cn doc](https://img.shields.io/badge/文档-中文版-blue.svg)](docs/README_ZH.md)
+- [Documents in English](docs/README.md)
+- [Documents in Chinese](docs/README_ZH.md)
 
 # 5.x Architecture
 <img src="https://skywalkingtest.github.io/page-resources/5.0/architecture.png"/>

README_ZH.md

@@ -3,8 +3,7 @@ Apache SkyWalking | [English](README.md)
 
 <img src="https://skywalkingtest.github.io/page-resources/3.0/skywalking.png" alt="Sky Walking logo" height="90px" align="right" />
 
-**SkyWalking**: 针对分布式系统的APM（应用性能监控）系统，特别针对微服务、cloud native和容器化(Docker, Kubernetes, Mesos)架构，
-其核心是个分布式追踪系统。
+**SkyWalking**: 针对分布式系统的APM（应用性能监控）系统，特别针对微服务、cloud native和容器化(Docker, Kubernetes, Mesos)架构
 
 [![GitHub stars](https://img.shields.io/github/stars/apache/incubator-skywalking.svg?style=for-the-badge&label=Stars&logo=github)](https://github.com/apache/incubator-skywalking)
 [![Twitter Follow](https://img.shields.io/twitter/follow/asfskywalking.svg?style=for-the-badge&label=Follow&logo=twitter)](https://twitter.com/AsfSkyWalking)
@@ -15,21 +14,34 @@ Apache SkyWalking | [English](README.md)
 [![Join the chat at https://gitter.im/openskywalking/Lobby](https://badges.gitter.im/openskywalking/Lobby.svg)](https://gitter.im/openskywalking/Lobby)
 [![OpenTracing-1.x Badge](https://img.shields.io/badge/OpenTracing--1.x-enabled-blue.svg)](http://opentracing.io)
 
-
-- Java自动探针，**不需要修改应用程序源代码**. 
-  - 高性能探针.
-  - [中间件，框架与类库支持列表](docs/Supported-list.md).
-- 手动探针
-  - [使用OpenTracing手动探针API](http://opentracing.io/documentation/pages/supported-tracers)
-  - 使用 [**@Trace**](docs/cn/Application-toolkit-trace-CN.md) 标注追踪业务方法
-  - 将 traceId 集成到 log4j, log4j2 或 logback这些日志组件中
-- 纯Java后端Collector实现，提供RESTful和gRPC接口。兼容接受其他语言探针发送数据
-- 社区探针和SDK
-  - [.NET Core](https://github.com/OpenSkywalking/skywalking-netcore)
+# Abstract
+**SkyWalking** 创建与2015年，提供分布式追踪功能。从5.x开始，项目进化为一个完成功能的[Application Performance Management](https://en.wikipedia.org/wiki/Application_performance_management)系统。
+他被用于追踪、监控和诊断分布式系统，特别是使用微服务架构，云原生或容积技术。提供以下主要功能：
+- 分布式追踪和上下文传输
+- 应用、实例、服务性能指标分析
+- 根源分析
+- 应用拓扑分析
+- 应用和服务依赖分析
+- 慢服务检测
+- 性能优化
+
+# Core features
+- 多语言探针或类库
+  - Java自动探针，追踪和监控程序时，不需要修改源码。
+  - 社区提供的其他多语言探针
+    * [.NET Core](https://github.com/OpenSkywalking/skywalking-netcore) 
+    * [Node.js](https://github.com/OpenSkywalking/skywalking-nodejs)
+- 多种后端存储： ElasticSearch， H2
+- 支持[OpenTracing](http://opentracing.io/)
+  - Java自动探针支持和OpenTracing API协同工作
+- 轻量级、完善功能的后端聚合和分析
+- 现代化Web UI
+- 日志集成
+- 应用、实例和服务的告警
 
 # Document
-[![EN doc](https://img.shields.io/badge/document-English-blue.svg)](docs/README.md) [![cn doc](https://img.shields.io/badge/文档-中文版-blue.svg)](docs/README_ZH.md)
-
+- [英文文档](docs/README.md)
+- [中文文档](docs/README_ZH.md)
 
 # 5.x Architecture
 <img src="https://skywalkingtest.github.io/page-resources/5.0/architecture.png"/>