add readme

7f846bfa · 宋海霞 · 6e327074 · 7f846bfa
--- a/readme.md
+++ b/readme.md
+# 教师参考答案
+请教师用户首先访问[教师项目群组](https://www.codecode.net/engintime/cp-lab/teachers-packet),申请权限并审核通过后，再[domain relative url](engintime/cp-lab/teachers-packet/Lab05.git)访问本项目的参考答案
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