chore: add bug report template

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,37 @@
+---
+name: Bug report
+about: For bugs that exist in markmap for VSCode
+title: "[BUG] "
+labels: bug
+assignees: ''
+---
+
+- [ ] I have searched for existing issues that already reported this problem and found none
+- [ ] The bug for the VSCode plugin
+  <!-- Note: for bugs in the REPL, please report to https://github.com/markmap/markmap -->
+- [ ] The bug is also present in [the web version of VSCode](https://vscode.dev) or GitHub Codespaces
+
+**Describe the bug**
+
+<!-- A clear and concise description of what the bug is. -->
+
+**To Reproduce**
+
+<!-- Note that issues without a reproduction may be closed immediately! -->
+
+**Expected behavior**
+
+<!-- A clear and concise description of what you expected to happen. -->
+
+**Actual behavior**
+
+<!-- If applicable, add screenshots to help explain your problem. -->
+
+**Environment:**
+
+- OS: [e.g. macOS]
+
+**Additional context**
+
+<!-- Add any other context about the problem here. -->
+