Add issue template

.github/ISSUE_TEMPLATE.md

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+#### Bug reports
+
+If it looks like a local environment issue, please try to debug yourself. Debugging local setup issues is not our top priority.
+
+Before opening an issue, please try to reproduce the issue on latest master. The bug you noticed might have already been fixed.
+
+If the issue can be reproduced on master, please make sure you provide the following:
+
+- exact steps to reproduce the issue
+- details of operating system, desktop environment, terminal emulator and shell
+
+If we need more information and there is no communication from the bug reporter within 7 days from the date of request, we will close the issue. If you have relevant information, resume discussion any time.
+
+#### Feature requests
+
+Please consider contributing the feature back to `nnn` yourself. Feel free to discuss in the ToDo list thread. We are more than happy to help.
+
+--- PLEASE DELETE THIS LINE AND EVERYTHING ABOVE ---