fix typo in roadmap.md, add new diagram, refine README (#1766)

* fix typo in roadmap.md, add new diagram, refine README

* fix typo
Signed-off-by: N周鹏飞@yunify <pengfeizhou@yunify.com>

README.md

@@ -12,12 +12,14 @@
 
 > English | [中文](README_zh.md)
 
-[KubeSphere](https://kubesphere.io/) is an enterprise-grade multi-tenant container platform built on [Kubernetes](https://kubernetes.io). It provides an easy-to-use UI for users to manage application workloads and computing resources with a few clicks, which greatly reduces the learning curve and the complexity of daily work such as development, testing, operation and maintenance. KubeSphere aims to alleviate the pain points of Kubernetes including storage, network, security and ease of use, etc.
+[KubeSphere](https://kubesphere.io/) is a multi-tenant enterprise-grade container platform built on [Kubernetes](http://kubernetes.io), with full-stack automated IT operation and streamlined DevOps workflows. KubeSphere provides developer-friendly wizard web UI, helps enterprises to build out a more robust and feature-rich platform, includes most common functionalities needed for enterprise Kubernetes strategy, such as the **Kubernetes resource management, DevOps (CI/CD), application lifecycle management, monitoring, logging, Service Mesh (Istio-based), multi-tenancy, alerting and notification, storage and networking, autoscaling, access control, GPU support, etc.**, as well as **multi-cluster management, Network Policy, registry management, security** in upcoming releases. KubeSphere is going to be a **distributed operating system with cloud native stack** based on Kubernetes, will be very well architected for **plug-and-play integration with its ecosystem** as well.
 
+KubeSphere provides a complete user experience around Kubernetes that incorporates a rich set of cloud native ecosystem tools, allows developers and DevOps teams use their favorite tools in a single front-end interface. KubeSphere delivers **consolidated views while integrating a wide breadth of ecosystem tools** upon Kubernetes and offer **consistent user experience** to reduce complexity. Most importantly, these functionalities are loosely coupled with the platform since they are pluggable and optional based on your demands, will not impact the flexibilty of Kubernetes.
 
-## Screenshots
+![](docs/images/kubesphere-platform-overview.png)
 
-> Note: The [Screenshots](docs/en/guides/screenshots.md) give a close insight into KubeSphere.
+
+> Note: The [Screenshots](docs/en/guides/screenshots.md) give a close insight into KubeSphere, see [What is KubeSphere](https://kubesphere.io/docs/v2.1/en/introduction/what-is-kubesphere) for details.
 
 
 <table>
@@ -74,11 +76,8 @@ It also supports a variety of open source storage solutions and cloud storage pr
 
 ## Architecture
 
-KubeSphere separates [frontend](https://github.com/kubesphere/console) and [backend](https://github.com/kubesphere/kubesphere) as shows below. KubeSphere can run anywhere from on-premise datacenter to any cloud to edge. In addition, it can be deployed on any Kubernetes distribution. Please check the [installation guide](https://github.com/kubesphere/ks-installer).
-
-> Note that there is only back-end source code in this repository，see [Console](https://github.com/kubesphere/console) for front-end source code.
+KubeSphere uses a loosely-coupled architecture that separates the [frontend](https://github.com/kubesphere/console) from the [backend](https://github.com/kubesphere/kubesphere), the back end can also be connected with external systems through the REST API, all components are designed as Docker containers. See [Architecture](https://kubesphere.io/docs/v2.1/en/introduction/architecture/) for details.
 
-![](https://pek3b.qingstor.com/kubesphere-docs/png/20190810073322.png)
 
 ## Latest Release
 
@@ -86,6 +85,8 @@ KubeSphere 2.1.0 was released on **November 12nd, 2019**. Check the [Release Not
 
 ## Installation
 
+KubeSphere can run anywhere from on-premise datacenter to any cloud to edge. In addition, it can be deployed on any Kubernetes distribution.
+
 > Attention: The following section is only used for minimal installation by default, see [Complete Installation Guide](https://kubesphere.io/docs/v2.1/en/installation/intro/) for details.
 
 ### Deploy on Existing Kubernetes
@@ -106,7 +107,9 @@ $ kubectl apply -f https://raw.githubusercontent.com/kubesphere/ks-installer/mas
 
 ### Deploy on Linux
 
-The installation is going to install KubeSphere and Kubernetes on your linux machines. It provides All-in-One and Multi-Node installation options.
+KubeSphere Installer can help you to install KubeSphere and Kubernetes on your linux machines. It provides [All-in-One](https://kubesphere.com.cn/docs/v2.1/en/installation/all-in-one/) and [Multi-Node](https://kubesphere.com.cn/docs/v2.1/en/installation/multi-node/) installation options.
+
+**Prerequisites**
 
 - Operating Systems
    - CentOS 7.5 (64 bit)

README_zh.md

@@ -11,11 +11,16 @@
 
 > [English](README.md) | 中文
 
-[KubeSphere](https://kubesphere.io/) 是在 [Kubernetes](https://kubernetes.io) 之上构建的以**应用为中心的**多租户**容器平台**，支持部署和运行在**任何基础设施之上**，提供**简单易用的操作界面**以及**向导式操作**方式，在降低用户使用容器调度平台学习成本的同时，极大减轻开发、测试、运维的日常工作的复杂度，旨在解决 Kubernetes 本身存在的存储、网络、安全和易用性等痛点。帮助企业轻松应对**敏捷开发、自动化运维、应用快速交付、微服务治理、多租户管理、监控日志告警、服务与网络管理、镜像仓库**等业务场景。
+[KubeSphere](https://kubesphere.io/) 是在 [Kubernetes](https://kubernetes.io) 之上构建的以**应用为中心的**多租户**容器平台**，提供全栈的 IT 自动化运维的能力，简化企业的 DevOps 工作流。KubeSphere 提供了 **运维友好的向导式操作界面**，帮助企业快速构建一个强大和功能丰富的容器云平台，包括 **Kubernetes 资源管理、DevOps (CI/CD)、应用生命周期管理、微服务治理 (Service Mesh)、多租户管理、监控日志、告警通知、存储与网络管理、GPU support** 等功能，未来还将提供 **多集群管理、Network Policy、镜像仓库管理** 等功能。KubeSphere 愿景是打造一个基于 Kubernetes 的云原生分布式操作系统，它的架构可以很方便地与云原生生态系统进行即插即用（plug-and-play）的集成。
 
-KubeSphere 已大规模服务于社区用户，广泛地应用在以容器为中心的开发测试及生产环境，大量服务平稳地运行在 KubeSphere 之上。
 
-> 说明：KubeSphere 目前最新的版本为高级版 2.1.0，并且所有版本 100% 开源，关于 KubeSphere 更详细的介绍与说明请参阅 [什么是 KubeSphere](https://kubesphere.com.cn/docs/v2.1/zh-CN/introduction/intro/)。
+KubeSphere 作为一个**全栈的容器平台**，不仅支持**安装和纳管原生 Kubernetes**，还设计了一套完整的管理界面方便开发者与运维在一个**统一的平台**中安装与管理最常用的云原生工具，**从业务视角提供了一致的用户体验来降低复杂性**，并且所有功能组件都是可插拔的。
+
+![](docs/images/kubesphere-platform-overview.png)
+
+KubeSphere 可以运行在任何私有或托管的 Kubernetes、私有云、公有云、VM 或物理环境之上。已大规模服务于社区用户，广泛地应用在以容器为中心的开发测试及生产环境，大量服务平稳地运行在 KubeSphere 之上。
+
+> 说明：KubeSphere 目前最新的版本为 2.1.0，并且所有版本 100% 开源，关于 KubeSphere 更详细的介绍与说明请参阅 [什么是 KubeSphere](https://kubesphere.com.cn/docs/v2.1/zh-CN/introduction/intro/)。
 
 
 点击 [KubeSphere 快览](docs/en/guides/screenshots.md) 快速查看 KubeSphere UI；
@@ -69,11 +74,8 @@ KubeSphere 已大规模服务于社区用户，广泛地应用在以容器为中
 
 ## 架构
 
-KubeSphere 采用了前后端分离的架构设计，后端的各个功能组件可通过 REST API 对接外部系统，KubeSphere 可以运行在任何 Kubernetes、私有云、公有云、VM 或物理环境之上。
-
-> 说明：本仓库仅包含后端代码，前端代码参考 [Console 项目](https://github.com/kubesphere/console)。
+KubeSphere 采用了前后端分离的架构设计，后端的各个功能组件可通过 REST API 对接外部系统，详见 [架构说明](https://kubesphere.com.cn/docs/v2.1/zh-CN/introduction/architecture/)。本仓库仅包含后端代码，前端代码参考 [Console 项目](https://github.com/kubesphere/console)。
 
-![](docs/images/architecture-zh.png)
 
 ## 最新发布
 

docs/roadmap.md

 # KubeSphere Roadmap
 
-KubeSphere Roadmap demonstrates a list of open source product development plans and features being split by the edition and modules, as well as OpenPitrix community's anticipation. Obviously, it details the future's direction of OpenPitrix, but may change over time. We hope that can help you to get familiar with the project plans and vision through the Roadmap. Of course, if you have any better ideas, welcome to [Issues](https://github.com/kubesphere/kubesphere/issues).
+KubeSphere Roadmap demonstrates a list of open source product development plans and features being split by the edition and modules, as well as KubeSphere community's anticipation. Obviously, it details the future's direction of KubeSphere, but may change over time. We hope that can help you to get familiar with the project plans and vision through the Roadmap. Of course, if you have any better ideas, welcome to [Issues](https://github.com/kubesphere/kubesphere/issues).
 
 ## Release Goals
 
@@ -38,4 +38,4 @@ KubeSphere Roadmap demonstrates a list of open source product development plans
 
 #### Security & Multitenancy
 
-#### Application Store (OpenPitrix)
+#### Application Lifecycle Management (OpenPitrix)