feat: add OI Wiki (#18)

Author: Ir1d

C-算法/README.md

@@ -24,6 +24,7 @@ Reference
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 - f-zyj/[ACM 模板以及个人平时训练的代码](https://github.com/f-zyj/ACM)
     > [ACM 在线模版 - 逐梦者](https://blog.csdn.net/f_zyj/article/details/51594851) - CSDN博客 
+- [OI Wiki](https://github.com/24OI/OI-wiki/)
 
 Index
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