Update issue template

Author: Speierers

docs/issue_template.md

@@ -1,12 +1,17 @@
-*Please add the labels (e.g. bug, feature request, ..) corresponding to this issue*
+*Please add one of the following label to your issue's title, and delete this section:*
+
+- [🐛 bug report]
+- [🔨 compilation issue]
+- [✨ feature request]
+- [❔ other question]
 
 ## Summary
 
-*Please enter a brief description of your issue*
+*Please enter a brief description of your issue <- [remove this]*
 
 ## System configuration
 
-*For bug report, please enter information regarding your system configuration*
+*For bug report, please enter information regarding your system configuration<- [remove this]*
 
 - Platform: ...
 - Compiler: ...
@@ -18,11 +23,11 @@
 
 ## Description
 
-*Please enter the full description of your issue*
+*Please enter the full description of your issue <- [remove this]*
 
 ## Steps to reproduce
 
-*For bug report, please enumerate the steps to follow in order to reproduce the issue*
+*For bug report, please enumerate the steps to follow in order to reproduce the issue <- [remove this]*
 
 1. ...
 2. ...