Add bug report issue template

.gitlab/issue_templates/bug_report.md

+## Expected Behavior
+<!--- If you're describing a bug, tell us what should happen -->
+<!--- If you're suggesting a change/improvement, tell us how it should work -->
+
+## Current Behavior
+<!-- If describing a bug, tell us what happens instead of the expected behavior. Provide a Screenshots if possible. -->
+<!-- If suggesting a change/improvement, explain the difference from current behavior -->
+
+## Possible Solution
+<!-- Not obligatory, but suggest a fix/reason for the bug, -->
+<!-- or ideas how to implement the addition or change -->
+
+## Steps to Reproduce (for bugs)
+<!-- Provide a an unambiguous set of steps to reproduce this bug. -->
+1.
+2.
+3.
+4.
+
+## Additional information
+<!-- Release ID and commit can be found on the starting splash screen or the options page. -->
+* Release ID:
+* Commit: (if available)
+* Save file