Introduce 'Add new feature' issue template

.github/ISSUE_TEMPLATE/add-new-feature---behavior.md

@@ -0,0 +1,19 @@
+---
+name: Add new feature / behavior
+about: Describe the desired product increment
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Current behavior**
+A clear and concise description of what  the current behavior is.
+Please also add screenshots
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+Please also add screenshots or link to figma if available
+
+**Additional context**
+Add any other context or screenshots about the feature request here.