Create ISSUE_TEMPLATE.md

ISSUE_TEMPLATE.md

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+## Issue
+### Expected Behavior
+<!--Description-->
+
+### Actual Behavior
+<!--Description-->
+
+### Steps to Reproduce
+<!--Description-->
+
+### Log
+```
+Please provide you log files at __LOGFILE__
+Default at "/var/log/cloudflareddns.log"
+```