Create ISSUE_TEMPLATE.md

Author: aleab

ISSUE_TEMPLATE.md

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+If this is a crash, bug or unexpected behaviour report, please use the following template.
+
+## EXPECTED BEHAVIOUR
+*(Write the expected behaviour here)*
+
+## ACTUAL BEHAVIOUR
+*(Write the actual behaviour here)*
+
+## STEPS TO REPRODUCE THE BEHAVIOUR
+*(Write the steps to reproduce the actual behaviour here)*
+
+## LOG FILE
+*(Drag and drop your `Toastify.log` file here; it can be found in `%LocalAppData%\Toastify`)*