docs(docs): add readme rewrit introduction

README-zh.md

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 ![logo](/docs/.vuepress/public/img/logo_text.png)
 
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 </div>
 
 简体中文 | [English](./README.md)
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 ## 介绍
 🚀Luckysheet ，一款纯前端类似excel的在线表格，功能强大、配置简单、完全开源。
 
+> Luckysheet 3.x 目前正在使用Typescript重构。
+
 ## 相关链接
  | 源码   | 文档 | Demo | 插件Demo | 论坛 |
  | ------ | -------- | ------ | ------ | ------ |

README.md

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 ## Introduction
 🚀Luckysheet is an online spreadsheet like excel that is powerful, simple to configure, and completely open source.
 
+> Luckysheet 3.x is currently being rewritten in Typescript.
+
 ## Links
  | Source Code   | Documentation | Demo | Plugins Demo | Forum |
  | ------ | -------- | ------ | ------ | ------ |