Update issue templates

.github/ISSUE_TEMPLATE/discussion.md

@@ -0,0 +1,17 @@
+---
+name: Discussion
+about: Something is missing or needs a change but no clear path forward exists
+title: "[Discussion]"
+labels: ''
+assignees: ''
+
+---
+
+# Use case description
+Describe the case that is going through your mind.
+
+# What feels not properly handled?
+Describe the current way the requirements reflect on that.
+
+# What would you have others discuss about that?
+State the points where you could need some input.