docs(readme): Update README.md to add centering alignment

Author: Jankin-Wu

README.md

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   <img src="http://oss.jankinwu.com/img/fnarwhal_login.png" alt="fnarwhal_login" width="600" />
 </p>
 
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 [![GitHub stars](https://img.shields.io/github/stars/FNOSP/fntv-client-multiplatform)](https://github.com/FNOSP/fntv-client-multiplatform/stargazers)
 [![GitHub forks](https://img.shields.io/github/forks/FNOSP/fntv-client-multiplatform)](https://github.com/FNOSP/fntv-client-multiplatform/network)
 [![GitHub issues](https://img.shields.io/github/issues/FNOSP/fntv-client-multiplatform)](https://github.com/FNOSP/fntv-client-multiplatform/issues)
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 基于 Compose Multiplatform 框架开发的适用于飞牛影视的跨平台客户端
 
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 ## 声明
 
 **本项目为飞牛 OS 爱好者开发的第三方影视客户端，与飞牛影视官方无关。使用前请确保遵守相关服务条款。**