Add issue template for extension request

Closes #1696

.github/ISSUE_TEMPLATE/bug-report.md

@@ -0,0 +1,29 @@
+---
+name: Bug report
+about: Report a bug and help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+<!--
+Please see https://github.com/cdr/code-server/blob/master/doc/FAQ.md#how-do-i-debug-issues-with-code-server
+and include any logging information relevant to the issue.
+
+Please search for existing issues before filing.
+
+If you can reproduce the issue on vanilla VS Code,
+please file the issue at the VS Code repository instead.
+
+Provide screenshots if applicable.
+
+Please fill in the issue template and try to be as detailed
+and clear as possible!
+-->
+
+- Web Browser:
+- Local OS:
+- Remote OS:
+- Remote Architecture:
+- `code-server --version`: