Update README

Author: Fanchao-Qi

README.md

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 ### [中文版本](README_ZH.md)
 
 This project contains core data of HowNet and OpenHowNet API developed by THUNLP, which provides a convenient way to search information in HowNet, display sememe trees, calculate word similarity via sememes, etc. You can also visit our [website](https://openhownet.thunlp.org) to enjoy searching and exhibiting sememes of words online.

README_ZH.md

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 ### [English Version](README.md)
 
 本项目存放HowNet核心数据和清华大学自然语言处理实验室（THUNLP）开发的OpenHowNet API，提供方便的义原信息查询、义原树展示、基于义原的词相似度计算等功能。您还可以访问我们的[网站](https://openhownet.thunlp.org)体验义原在线查询和展示功能。