chore: add issue templates

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,43 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: "[Bug report]"
+labels: ''
+assignees: ''
+
+---
+
+<!-- Please fill in relevant information as much as possible. That would be helpful to locate the problem and save us each other's time -->
+
+<!-- If some fields are irrelevant or you are not sure, remove it or mark it as "not related" / not sure" -->
+
+<!-- If you don't follow the template and not providing valid infomation, we'll close your issue without further reply -->
+
+## Bug report
+
+### Description
+
+<!-- A clear and concise description of what the bug is. -->
+
+### Steps to reproduce
+
+<!-- Steps to reproduce the behavior -->
+
+- Reproduction link / repo:
+
+### Expected behavior
+
+<!-- A clear and concise description of what you expected to happen. -->
+
+### Screenshots
+
+<!-- If applicable, add screenshots to help explain your problem. -->
+
+### Environment info
+
+- Browser:
+- Output of `vuepress info`:
+
+```sh
+# Paste output of `vuepress info` here
+```

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: "[Feature request]"
+labels: ''
+assignees: ''
+
+---
+
+## Feature request
+
+### Description
+
+<!-- Is your feature request related to a problem? Please describe. This should be a clear and concise description of what the problem is. -->
+
+### Proposed Solution
+
+<!-- Describe the solution you'd like. This should be a clear and concise description of what you want to happen -->