doc: Update README.md

Author: jaywcjlove

README.md

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+> This repository serves a dual purpose: it hosts the source code for Vidwall's official website and acts as a platform for collecting user feedback and tracking issues. This approach allows us to meet the website requirement for app store approval without incurring extra costs.
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 RegexMate is a regular expression application available for macOS and iOS. It features a clean user interface and powerful functionalities, enabling users to easily create, test, and utilize regular expressions.
 
 ![RegexMate 4](./assets/screenshots-4.png)

README.zh.md

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+> 本仓库既是 Vidwall 官网的源码，也是我们收集用户反馈和追踪问题的平台。我们这样做是为了在不增加额外成本的前提下，满足应用通过应用商店审核所必需的官网要求。
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