Create issue_template.md

Author: hlflanagan

issue_template.md

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+<!--- Provide a general summary of the issue in the Title above -->
+
+## Code Version
+<!-- What version and/or branch of the code are you running? -->
+
+## Expected Behavior
+<!--- Tell us what should happen -->
+
+## Current Behavior
+<!--- Tell us what happens instead of the expected behavior -->
+
+## Possible Solution
+<!--- Not obligatory, but suggest a fix/reason for the bug, -->
+
+## Steps to Reproduce
+<!--- Provide a link to a live example, or an unambiguous set of steps to -->
+<!--- reproduce this bug. Include code to reproduce, if relevant -->
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