doc: Update issue templates

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,38 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: "[BUG] "
+labels: ''
+assignees: ''
+
+---
+
+<!-- Here is for bug reports ONLY! 
+
+If you're looking for help, please check our mail list and the Gitter room.
+
+Please try to use English to describe your issue, or at least provide a snippet of English translation.
+
+Security problem: 如果您发现 Sentinel 项目中存在安全问题，请通过 [ASRC（Alibaba Security Response Center 阿里安全响应中心）](https://security.alibaba.com/) 告知我们，请不要直接提公开 issue.
+-->
+
+## Issue Description
+
+Type: *bug report*
+
+### Describe what happened
+
+
+### Describe what you expected to happen
+
+
+### How to reproduce it (as minimally and precisely as possible)
+
+1. 
+2. 
+3. 
+
+### Tell us your environment
+
+
+### Anything else we need to know?

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,27 @@
+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+<!-- Here is for bug reports and feature requests ONLY! 
+
+If you're looking for help, please check our mail list and the Gitter room.
+
+Please try to use English to describe your issue, or at least provide a snippet of English translation.
+-->
+
+## Issue Description
+
+Type: *feature request*
+
+### Describe what feature you want
+
+### Describe your initial design (if present)
+
+### Additional context
+
+Add any other context or screenshots about the feature request here.