Add issue template

Author: SimonBaeumer

.github/ISSUE_TEMPLATE.md

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+### Prerequisites
+
+* [ ] Can you reproduce the problem in safe mode?
+* [ ] Are you running the latest version?
+* [ ] Are you reporting to the correct repository?
+* [ ] Did you perform a cursory search?
+
+### Description
+
+[Description of the bug or feature]
+
+### Steps to Reproduce
+
+1. [First Step]
+2. [Second Step]
+3. [and so on...]
+
+**Expected behavior:** [What you expected to happen]
+
+**Actual behavior:** [What actually happened]
+
+### Specifications
+
+ - Version:
+ - Platform: 
+ - Subsystem: 
+ 
+You can get the version information from executing `commander --version`.