增加Issue的默认模板

增加Issue的默认模板,方便分析跟进

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,27 @@
+<!--
+please follow the issue template below for bug reports and feature requests
+for example, if you are reporting a bug, please provide the following information:
+dbtype: mysql
+dbversion: 5.7
+duird version: 1.2.22
+error sql: select * from test
+error info: error message
+-->
+**dbtype:** 
+**dbversion:** 
+**druid verion:**
+**error sql:**
+**testcase code:**
+**stacktrace info:**
+**error info:**
+---
+<!--
+Thanks for taking the time to create an issue. Please read the following:
+
+- For bugs, specify affected versions and explain what you are trying to do.
+- For enhancements, provide context and describe the problem.
+
+Issue or Pull Request? Create only one, not both. GitHub treats them as the same.
+If unsure, start with an issue, and if you submit a pull request later, the
+issue will be closed as superseded.
+-->