Add GitHub issue template

.github/ISSUE_TEMPLATE.md

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+
+<!-- Thank you for being interested in nvm, here is a quick form for problem reporting, please help us fill it if you are going to open an issue with a bug/problem report, if you are just going to suggest a feature or something else but not like this, please just remove it, thanks! -->
+
+- Operating system and version:
+
+- `nvm debug` output:
+```
+```
+
+- How did you install nvm (e.g. install script in readme, homebrew):
+
+- Issue description:
+
+- How to reproduce the issue:
+