Merge pull request #3011 from nightscout/issue_template

Create issue_template.md

docs/issue_template.md

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+Please include the following information with your bug report:
+
+Is this a new bug with the latest release, have you seen this earlier?
+
+Which device / browser version was used to reproduce the bug?
+
+Does this happen every time you launch Nightscout, or sometimes?
+
+Steps how to reproduce (if you can’t reproduce the issue, please don’t report the issue / if we can't reproduce the bug, we can't fix)
+
+Please include 1 or more screenshots of the issue appearing, ideally with an annotation on what's wrong