doc: Update README.md

Author: jaywcjlove

README.md

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-RegexMate is a beautifully designed regex app built exclusively for macOS. With a clean and intuitive interface, it empowers you to craft and test regular expressions with ease.
+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 screenshots-4](./assets/screenshots-4.png)
 

README.zh.md

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 </div>
 
-RegexMate 是一款专为 macOS 设计的正则表达式应用程序，拥有简洁的用户界面和强大的功能，可帮助您轻松地创建、测试和使用正则表达式。
+RegexMate 是一款正则表达式应用程序，支持 macOS 和 iOS 平台。它拥有简洁的用户界面和强大的功能，能够帮助用户轻松地创建、测试和使用正则表达式。
 
 ![RegexMate screenshots-4](./assets/screenshots-4-cn.png)