Create ISSUE_TEMPLATE.md

.github/ISSUE_TEMPLATE.md

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+## Before we start
+- Please doublecheck there is no existing issue for your problem/feature request.  
+- Please delete any obsolete sections (including this one) from this template before submitting your issue.
+
+## Bug report
+
+### Expected Behavior
+Describe the expected behavior here
+
+### Actual Behavior
+Describe the actual behavior here
+
+### Steps to reproduce behavior
+- Step 1
+- Step 2
+
+### Log/Screenshots
+If applicable, provide a log of the session where the problem occoured.  
+See here: https://github.com/HearthSim/Hearthstone-Deck-Tracker/wiki/Reporting-Issues