Add npm downloads badge

README.md

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 > «NexT» is a high quality elegant [Hexo](https://hexo.io) theme. It is crafted from scratch with love.
 
 [![NPM version](https://img.shields.io/npm/v/hexo-theme-next?color=red&logo=npm&style=flat-square)](https://www.npmjs.com/package/hexo-theme-next)
+[![NPM Downloads](https://img.shields.io/npm/dm/hexo-theme-next?logo=npm&style=flat-square)](https://www.npmjs.com/package/hexo-theme-next)
 [![Required Hexo version](https://img.shields.io/badge/hexo-%3E=5.3.0-blue?style=flat-square&logo=hexo)](https://hexo.io)
 [![License](https://img.shields.io/badge/license-%20AGPL-orange?style=flat-square&logo=gnu)](https://github.com/next-theme/hexo-theme-next/blob/master/LICENSE.md)
 [![Build Status](https://img.shields.io/github/actions/workflow/status/next-theme/hexo-theme-next/linter.yml?branch=master&label=test&logo=github&style=flat-square)](https://github.com/next-theme/hexo-theme-next/actions?query=workflow%3ALinter)

docs/ru/README.md

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 > «NexT» — элегантная высококачественная тема под [Hexo](https://hexo.io). Сделана с нуля, с любовью.
 
 [![NPM version](https://img.shields.io/npm/v/hexo-theme-next?color=red&logo=npm&style=flat-square)](https://www.npmjs.com/package/hexo-theme-next)
+[![NPM Downloads](https://img.shields.io/npm/dm/hexo-theme-next?logo=npm&style=flat-square)](https://www.npmjs.com/package/hexo-theme-next)
 [![Required Hexo version](https://img.shields.io/badge/hexo-%3E=5.3.0-blue?style=flat-square&logo=hexo)](https://hexo.io)
 [![License](https://img.shields.io/badge/license-%20AGPL-orange?style=flat-square&logo=gnu)](https://github.com/next-theme/hexo-theme-next/blob/master/LICENSE.md)
 [![Build Status](https://img.shields.io/github/actions/workflow/status/next-theme/hexo-theme-next/linter.yml?branch=master&label=test&logo=github&style=flat-square)](https://github.com/next-theme/hexo-theme-next/actions?query=workflow%3ALinter)

docs/zh-CN/README.md

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 > «NexT» 是一款风格优雅的高质量 [Hexo](https://hexo.io) 主题，自点点滴滴中用爱雕琢而成。
 
 [![NPM version](https://img.shields.io/npm/v/hexo-theme-next?color=red&logo=npm&style=flat-square)](https://www.npmjs.com/package/hexo-theme-next)
+[![NPM Downloads](https://img.shields.io/npm/dm/hexo-theme-next?logo=npm&style=flat-square)](https://www.npmjs.com/package/hexo-theme-next)
 [![Required Hexo version](https://img.shields.io/badge/hexo-%3E=5.3.0-blue?style=flat-square&logo=hexo)](https://hexo.io)
 [![License](https://img.shields.io/badge/license-%20AGPL-orange?style=flat-square&logo=gnu)](https://github.com/next-theme/hexo-theme-next/blob/master/LICENSE.md)
 [![Build Status](https://img.shields.io/github/actions/workflow/status/next-theme/hexo-theme-next/linter.yml?branch=master&label=test&logo=github&style=flat-square)](https://github.com/next-theme/hexo-theme-next/actions?query=workflow%3ALinter)