Update bug_report.md

.github/ISSUE_TEMPLATE/bug_report.md

@@ -7,6 +7,8 @@ assignees: ''
 
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+## 请完整读完[README](https://github.com/Jinnrry/PMail/blob/master/README_CN.md)再提问! / Before asking questions, please read the [README](https://github.com/Jinnrry/PMail/blob/master/README.md) !
+
 **请说明问题 / Describe the bug**
 A clear and concise description of what the bug is.