Fix link not found issue: GENERATE.md -> CONTRIBUTING.md

- add CONTRIBUTING-CN.md for Chinese contributor

Author: Binlogo

source-cn/Index/header.md

@@ -7,3 +7,8 @@
 👷 源项目由 [@nsmeme](http://twitter.com/nsmeme) (Oktawian Chojnacki) 维护。
 
 🇨🇳 中文版由 [@binglogo](https://twitter.com/binglogo) 整理翻译。
+
+🚀 如何由源代码，并生成 README 与 Playground 产物，请查看：
+- [CONTRIBUTING.md](https://github.com/ochococo/Design-Patterns-In-Swift/blob/master/CONTRIBUTING.md)
+- [CONTRIBUTING-CN.md](https://github.com/ochococo/Design-Patterns-In-Swift/blob/master/CONTRIBUTING-CN.md)
+

source/Index/header.md

@@ -10,4 +10,4 @@ A short cheat-sheet with Xcode 10.2 Playground ([Design-Patterns.playground.zip]
 
 👷 中文版由 [@binglogo](https://twitter.com/binglogo) (棒棒彬) 整理翻译。
 
-🚀 How to generate README, Playground and zip from source: [GENERATE.md](https://github.com/ochococo/Design-Patterns-In-Swift/blob/master/GENERATE.md)
+🚀 How to generate README, Playground and zip from source: [CONTRIBUTING.md](https://github.com/ochococo/Design-Patterns-In-Swift/blob/master/CONTRIBUTING.md)