Add main differences between Text and ExtendedText

Author: zmtzawqlp

README-ZH.md

@@ -14,7 +14,14 @@
 - [Flutter RichText 支持特殊文字效果](https://juejin.im/post/5c8bf4fce51d451066008fa2)
 - [Flutter RichText支持文本选择](https://juejin.im/post/5cff71d46fb9a07ea6486a0e)
 
-欢迎加入[Flutter Candies](https://github.com/fluttercandies)，一起生产可爱的Flutter小糖果(QQ群181398081)
+
+ExtendedText 是 Flutter 官方 Text 的三方扩展库，主要扩展功能如下:
+| 功能 | ExtendedText | Flutter 官方 Text |
+|--------------------------------------|-----------------------------------------------------------|-----------------------------------------------------|
+| 支持自定义文本溢出效果 | 支持，可以自定义溢出的 Widget，并控制溢出位置（前、中、后） | 不支 持 [26748](https://github.com/flutter/flutter/issues/26748) |
+| 支持复制特殊文本的真实值 | 支持，可以复制出文本的真实值，而不仅是 WidgetSpan 的占位值 | 只能复制出 WidgetSpan 的占位值 (\uFFFC) |
+| 根据文本格式快速构建富文本 | 支持，可以根据文本格式快速构建富文本 | 不支持 |
+
 
 ## 目录
 - [extended_text](#extendedtext)

README.md

@@ -7,6 +7,16 @@ Language: English | [中文简体](README-ZH.md)
 Extended official text to build special text like inline image or @somebody quickly,it also support custom background,custom over flow and custom selection toolbar and handles.
 
 [Web demo for ExtendedText](https://fluttercandies.github.io/extended_text/)
+
+ExtendedText is a third-party extension library for Flutter's official Text component. The main extended features are as follows:
+
+| Feature | ExtendedText | Text |
+|------------------------------------------|-------------------------------------------------------------|-------------------------------------------------------|
+| Customized text overflow effects | Supported, allows customizing the overflow widget and controlling overflow positions (before, middle, after) | Not supported ([26748](https://github.com/flutter/flutter/issues/26748)) |
+| Copying the actual value of special text | Supported, enables copying the actual value of the text, not just the placeholder value of WidgetSpan | Can only copy the placeholder value of WidgetSpan (\uFFFC) |
+| Quick construction of rich text based on text format | Supported, enables quick construction of rich text based on text format | Not supported |
+
+
 ## Table of contents
 - [extended\_text](#extended_text)
  - [Table of contents](#table-of-contents)