add issue template

.github/ISSUE_TEMPLATE/issue.md

@@ -0,0 +1,24 @@
+---
+name: Issue
+about: Bug reports or feature requests
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+<!--
+Welcome to v86's issue tracker!
+
+We use this tracker for bug reports or feature requests. For user support, questions or general comments, use the chat at https://gitter.im/copy/v86 or the forum at https://github.com/copy/v86/discussions
+
+Please don't ask for support for any version of Windows. There are many existing issues at https://github.com/copy/v86/issues?q=is%253Aissue+windows. See also docs/windows-xp.md.
+
+Before reporting OS incompatibilities, check existing issues and the compatibility section of the readme.
+
+When reporting issues, please provide the following information:
+- Version of v86 (see the bottom of index.html or the output of `git describe --tags HEAD`)
+- Browser/OS
+- The browser's console output: Open debug.html and press ctrl+shift+k (firefox) or ctrl+shift+j (chromium)
+- If relevant, upload the disk images to allow developers to reproduce the problem locally
+-->