Merge pull request #30 from hitsz-ids/document-update

Add Slack Shield in Readme

README.md

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   <img src="docs/sdg_logo.png" width="400" >
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-# 🚀 Introduction
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+[![License](https://img.shields.io/badge/License-Apache%202-2162A3.svg)](https://www.apache.org/licenses/LICENSE-2.0.html)  [![CN doc](https://img.shields.io/badge/Doc-English-2162A3.svg)](README.md)  [![slack](https://img.shields.io/badge/Slack-join%20chat-ff69b4.svg?style=flat-square)](https://join.slack.com/t/hitsz-ids/shared_invite/zt-2395mt6x2-dwf0j_423QkAgGvlNA5E1g)
 
-[![License](https://img.shields.io/badge/License-Apache%202-2162A3.svg)](https://www.apache.org/licenses/LICENSE-2.0.html)  [![CN doc](https://img.shields.io/badge/文档-中文版-2162A3.svg)](README_ZH_CN.md)
+</center>
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+# 🚀 Introduction
 
 Synthetic Data Generator (SDG) is a framework focused on quickly generating high-quality structured tabular data. It supports more than 10 single-table and multi-table data synthesis algorithms, achieving up to 120 times performance improvement, and supports differential privacy and other methods to enhance the security of synthesized data.
 

README_ZH_CN.md

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   <img src="docs/sdg_logo.png" width="400" >
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 # 🚀 合成数据生成器 -- 快速生成高质量合成数据！
 
-[![License](https://img.shields.io/badge/License-Apache%202-2162A3.svg)](https://www.apache.org/licenses/LICENSE-2.0.html)  [![CN doc](https://img.shields.io/badge/Doc-English-2162A3.svg)](README.md)
+[![License](https://img.shields.io/badge/License-Apache%202-2162A3.svg)](https://www.apache.org/licenses/LICENSE-2.0.html)  [![CN doc](https://img.shields.io/badge/Doc-English-2162A3.svg)](README.md)  [![slack](https://img.shields.io/badge/Slack-join%20chat-ff69b4.svg?style=flat-square)](https://join.slack.com/t/hitsz-ids/shared_invite/zt-2395mt6x2-dwf0j_423QkAgGvlNA5E1g)
+
+</center>
 
 合成数据生成器（Synthetic Data Generator，SDG）是一个专注于快速生成高质量结构化表格数据的组件。支持10余种单表、多表数据合成算法，实现最高120倍性能提升，支持差分隐私等方法，加强合成数据安全性。