[doc] add cn doc

CONTRIBUTING.md

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+# Contribute to Documentation
+
+Contributing to the **Nebula Graph** documentation can be a rewarding experience. We welcome your participation to help make the documentation better!
+
+## What to Contribute
+
+You can start from any of the documents in this repository:
+
+- Fix typos or format (punctuation, space, indentation, code block, etc.)
+- Fix or update inappropriate or outdated descriptions
+- Add new document
+- Raise or resolve [docs issues](https://github.com/vesoft-inc/nebula-docs/issues)
+- Review Pull Requests created by others
+
+## Before Contributing
+
+Before contributing, please take a quick look at some general information about **Nebula Graph** documentation maintenance.
+
+- [Markdown Rules](https://github.com/DavidAnson/markdownlint/blob/master/doc/Rules.md)
+- [Developer Documentation Style Guide](docs/manual-EN/4.contributions/developer-documentation-style-guide.md)
+
+## How to Contribute
+
+There are many ways to contribute:
+
+- Raise a documentation issue on [GitHub](https://github.com/vesoft-inc/nebula/issues).
+- Fork the documentation, make changes or add new content on your local branch, and submit a pull request (PR) to the master branch for the docs.

LICENSE

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README.md

@@ -1,2 +1,41 @@
-# nebula-docs-cn
-Repository for the Chinese documentations
+# Nebula Graph Documentation
+
+This repository holds all the source files of **Nebula Graph** Documentations at [Official Documentation Site](https://docs.nebula-graph.io/).
+
+## Documentation Structure
+
+The general **Nebula Graph** documentation structure is as follows:
+
+```bash
+├── Language
+├── Overview
+    ├── Introduction
+    ├── Concepts
+    ├── Quick Start
+        ├── Get Started
+        ├── ...
+├── Query Language
+    ├── Data Types
+        ├── ...
+    ├── Functions and Operators
+        ├── ...
+    ├── Language Structure
+        ├── ...
+    ├── Statement Syntax
+        ├── ...
+├── Build Develop and Administration
+    ├── Build
+        ├── ...
+    ├── ...
+...
+```
+
+Detail TOC (table of content) please refer to the following links.
+
+- [Documentation Index](docs/manual-EN/README.md)
+- [文档索引](docs/manual-CN/README.md)
+- [Official Documentation Site](https://docs.nebula-graph.io/)
+
+## Contributing
+
+If you find documentation issues, feel free to create an [Issue](https://github.com/vesoft-inc/nebula-docs/issues) to let us know or directly create a [Pull Request](https://github.com/vesoft-inc/nebula-docs/pulls) to help fix or update it. See **Nebula Graph** [CONTRIBUTING](CONTRIBUTING.md) guide to get started. :)

docs/.gitignore

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+*.zip
+*.pdf
+

docs/CNAME

@@ -0,0 +1 @@
+docs.nebula-graph.io

docs/README.md

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+# Nebula Graph 是什么
+
+**Nebula Graph** 是一款开源的图数据库，擅长处理千亿个顶点和万亿条边的超大规模数据集。
+
+与其他图数据库产品相比，**Nebula Graph** 具有如下优势：
+
+* 全对称分布式架构
+* 存储与计算分离
+* 水平可扩展性
+* RAFT 协议下的数据强一致
+* 类 SQL 查询语言
+* 用户鉴权
+
+## 产品路线图
+
+**Nebula Graph** 产品规划路线图请参见 [roadmap](https://github.com/vesoft-inc/nebula/wiki/Nebula-Graph-Roadmap)。
+
+## 图可视化
+
+查看[图可视化](https://github.com/vesoft-inc/nebula-web-docker)，开启图数据可视化探索之旅。
+
+## 支持的客户端
+
+* [Go](https://github.com/vesoft-inc/nebula-go)
+* [Python](https://github.com/vesoft-inc/nebula-python)
+* [Java](https://github.com/vesoft-inc/nebula-java)
+
+## 快速使用
+
+请查看[快速使用手册](manual-CN/1.overview/2.quick-start/1.get-started.md)，开始使用 **Nebula Graph**。
+
+在开始使用 **Nebula Graph** 之前，必须通过[编译源码](manual-CN/3.build-develop-and-administration/1.build/1.build-source-code.md)，[rpm/deb 包](manual-CN/3.build-develop-and-administration/2.install/1.install-with-rpm-deb.md) 或者 [docker compose](https://github.com/vesoft-inc/nebula-docker-compose) 方式安装 **Nebula Graph**。您也可以观看[视频](https://space.bilibili.com/472621355)学习如何安装 **Nebula Graph**。
+
+## 获取帮助
+
+在使用 **Nebula Graph** 过程中遇到任何问题，都可以通过下面的方式寻求帮助：
+
+* [知乎](https://www.zhihu.com/org/nebulagraph/activities)
+* [SegmentFault](https://segmentfault.com/t/nebula)
+* [官方论坛](https://discuss.nebula-graph.io)
+
+## 文档
+
+* [简体中文](https://github.com/vesoft-inc/nebula/blob/master/docs/manual-CN/README.md)
+* [English](https://github.com/vesoft-inc/nebula/blob/master/docs/manual-EN/README.md)
+
+## Nebula Graph 产品架构图
+
+![image](https://github.com/vesoft-inc/nebula-docs/raw/master/images/Nebula%20Arch.png)
+
+## 如何贡献
+
+**Nebula Graph** 是一个完全开源的项目，欢迎开源爱好者通过以下方式参与到 **Nebula Graph** 社区：
+
+* 从标记为 [good first issues](https://github.com/vesoft-inc/nebula/issues?q=is%3Aissue+is%3Aopen+label%3A%22good+first+issue%22) 的问题入手
+* 贡献代码，详情请参见 [如何贡献](manual-CN/4.contributions/how-to-contribute.md)
+* 直接在GitHub上提 [Issue](https://github.com/vesoft-inc/nebula/issues)
+
+## 许可证
+
+**Nebula Graph** 使用 [Apache 2.0](https://www.apache.org/licenses/LICENSE-2.0) 许可证，您可以免费下载，修改以及部署源代码。您还可以将 **Nebula Graph** 作为后端服务部署以支持您的 SaaS 部署。
+
+为防止云供应商从项目赢利而不回馈，**Nebula Graph** 在项目中添加了 [Commons Clause 1.0](https://commonsclause.com/) 条款。如上所述，**Nebula Graph** 是一个完全开源的项目，欢迎您就许可模式提出建议，帮助 **Nebula Graph** 社区更好地发展。
+
+## 联系方式
+
+* 访问官网 [Home Page](http://nebula-graph.io/)。
+* [![WeiXin](https://img.shields.io/badge/WeChat-%E5%BE%AE%E4%BF%A1-brightgreen)](https://user-images.githubusercontent.com/38887077/67449282-4362b300-f64c-11e9-878f-7efc373e5e55.jpg)
+* [![Sina Weibo](https://img.shields.io/badge/Weibo-%E5%BE%AE%E5%8D%9A-red)](https://weibo.com/p/1006067122684542/home?from=page_100606&mod=TAB#place)
+* email: info@vesoft.com