docs(README): add Chinese modding tutorial link to documentation

- Included a link to the Chinese Slay the Spire 2 modding tutorial in both English and Chinese README files, enhancing accessibility for Chinese-speaking modders.

Author: BAKAOLC

README.md

@@ -10,6 +10,9 @@ API and other libraries such as [BaseLib](https://github.com/Alchyr/BaseLib-StS2
 
 Documentation site: https://sts2-ritsulib.ritsukage.com/
 
+Chinese Slay the Spire 2 modding tutorial:
+https://tutorials.sts2modding.com/ ([GitHub](https://github.com/GlitchedReme/SlayTheSpire2ModdingTutorials))
+
 ## Install
 
 Reference the NuGet package in your mod project:

README.zh.md

@@ -8,6 +8,9 @@ RitsuLib 提供内容注册、模型身份、生命周期、持久化、设置
 
 文档站：https://sts2-ritsulib.ritsukage.com/
 
+中文《杀戮尖塔 2》模组制作教程：
+https://tutorials.sts2modding.com/（[GitHub](https://github.com/GlitchedReme/SlayTheSpire2ModdingTutorials)）
+
 ## 安装
 
 在 Mod 项目中引用 NuGet 包：