Create ISSUE_TEMPLATE.md

ISSUE_TEMPLATE.md

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+## Actual behaviour
+<!--- Please describe what problem you have noticed -->
+
+## Expected behaviour
+<!--- Please describe what you expect to happen instead -->
+
+## Steps to reproduce the problem
+<!--- Explain step by step what you did when the problem occurs -->
+1. 
+2. 
+3. 
+
+## Specifications
+- Plattform: 
+- OS: 
+- Version:   <!--- if there is one -->