update readme

Author: hackware1993

README.md

@@ -6,6 +6,10 @@
 
 [简体中文](https://github.com/hackware1993/flutter-constraintlayout/blob/master/README_CN.md)
 
+I have developed the world's fastest general purpose sorting algorithm, which is on average 3 times
+faster than Quicksort and up to 20 times
+faster, [ChenSort](https://github.com/hackware1993/ChenSort)
+
 A super powerful Stack, build flexible layouts with constraints. Similar to ConstraintLayout for
 Android and AutoLayout for iOS. But the code implementation is much more efficient, it has O(n)
 layout time complexity and no linear equation solving is required.

README_CN.md

@@ -6,6 +6,8 @@
 
 [English](https://github.com/hackware1993/flutter-constraintlayout/blob/master/README.md)
 
+我开发了世界上最快的通用排序算法，它平均比快速排序快 3 倍，最多快 20 倍，[ChenSort](https://github.com/hackware1993/ChenSort)
+
 一个超级强大的 Stack，使用约束构建极为灵活的布局，和 Android 下的 ConstraintLayout 和 iOS 下的 AutoLayout 类似。但代码实现却高效得多，它具有 O(n)
 的布局时间复杂度，无需线性方程求解。