Update README.md

Author: wwj718

README.md

@@ -29,5 +29,8 @@ CodeLab Mindstorms关注编程教育,  计划翻译和解读编程教育领域
 | [A new definition of Computational Thinking...](https://computinged.wordpress.com/2019/04/29/what-is-computational-thinking-its-the-friction-that-we-want-to-minimize/) | [计算思维的新定义](https://github.com/Scratch3Lab/codelab-mindstorms/blob/master/%E8%AF%91%E6%96%87/A-new-definition-of-Computational-Thinking.md) | 廖曼江 |
 | [Thought as a Technology](http://cognitivemedium.com/tat/) | [思想--作为一种技术](https://www.codelab.club/blog/thought-as-a-technology/) | 吴文杰 |
 | [TWO BIG SCHOOLS OF OBJECT-ORIENTED PROGRAMMING](http://stereobooster.github.io/two-big-schools-of-object-oriented-programming) | [面向对象编程(OOP)的两大学派](https://github.com/Scratch3Lab/codelab-mindstorms/blob/master/%E8%AF%91%E6%96%87/Two-Big-Schools-Of-Object-Orinted-Programming.md) | [Angel_Kitty](https://github.com/AngelKitty) |
+| [Design Principles Behind Smalltalk](https://www.codelab.club/blog/design-principles-behind-smalltalk/) | [Smalltalk背后的设计原则](https://www.codelab.club/blog/design-principles-behind-smalltalk/) | 吴文杰 |
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