doc: update README.md

Author: jaywcjlove

README.md

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+> [!TIP]
+> Declaration: This project is not an open-source project. The repository serves as the official website, used to collect issues and user demands. This is done to save costs, because without an official website, the application cannot pass the review.
+<!--idoc:ignore:end-->
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 <div align="center">
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README.zh.md

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+<!--idoc:ignore:start-->
+> [!TIP]
+> 声明：此项目并非开源项目，仓库作为官方网站，用于收集问题和用户需求。这样做是为了节省成本，因为没有官网，应用无法通过审核。
+<!--idoc:ignore:end-->
+
 <div align="center">
   <br />
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