Create issue_template.md (#58)

Author: fractalwrench

issue_template.md

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+### Expected behavior
+*[Insert details on expected behaviour]*
+
+### Observed behavior
+*[Insert details on observed behaviour]*
+
+### Steps to reproduce
+*[Insert reproduction steps (if known)]*
+
+### Version
+*[Insert version information]*
+
+### Additional information
+*[Insert any additional information]*
+
+#### Can't comment on Issues?
+Some users have been unable to comment on Github issues when an [adblocker extension is enabled](https://docs.bugsnag.com/platforms/browsers/faq/#is-bugsnag-blocked-by-ad-blockers).
+We recommend temporarily disabling the extension, or if that fails, contacting [email protected].