docs(readme): update readme

README-CN.md

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-[MQTT X](https://mqttx.app/cn) 是 [EMQ](http://emqx.io/cn) 开源的一款跨平台 MQTT 5.0 桌面客户端，它支持 macOS, Linux, Windows。
+[MQTT X](https://mqttx.app/cn) 是 [EMQ](http://emqx.io/cn) 开源的一款跨平台 MQTT 5.0 桌面客户端，它支持 macOS, Linux, Windows，并且支持 MQTT 消息格式转换。
 
 [MQTT X](https://mqttx.app/cn) 的用户界面借助聊天软件的形式简化了页面的操作逻辑，用户可以快速创建连接保存并同时建立多个连接客户端，方便用户快速测试 MQTT/TCP、MQTT/TLS、MQTT/WebSocket 的 **连接/发布/订阅** 功能及其他特性。
 

README.md

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-[MQTT X](https://mqttx.app) is a cross-platform MQTT 5.0 desktop client open sourced by [EMQ](https://emqx.io), which supports macOS, Linux, and Windows.
+[MQTT X](https://mqttx.app) is a cross-platform MQTT 5.0 desktop client open sourced by [EMQ](https://emqx.io), which can run on macOS, Linux and Windows, and supports formatting MQTT payload.
 
 [MQTT X](https://mqttx.app) simplifies the operation logic of the page with the help of chatting software. The user can quickly create a connection to save and establish multiple connection clients at the same time. It is convenient for the user to quickly test the connection of MQTT/TCP、MQTT/TLS, MQTT/WebSocket Publish / Subscribe functions and other features.