Created a template for new issues.

.github/ISSUE_TEMPLATE.md

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+##### Brief Description
+
+
+
+OS: Windows / OS X / Linux (include version and/or distro)
+
+
+##### Used headers
+
+
+
+##### Used settings
+
+
+Target: MSVC/GCC/Clang
+
+Other settings 
+
+
+##### Stack trace or incompilable generated code
+
+
+