Created Github issue template

ISSUE_TEMPLATE.md

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+## Minimal Code Example
+
+```
+```
+
+## Conditions
+
+.                     | .
+--------------------- | ------------------
+**Operating System:** | ?
+**Compiler:**         | ?
+**Compiler flags:**   | ?
+**maddy version:**    | ?
+
+## Description
+
+What did you try? What is not working?