chore: add `feature_request.md` issue template

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,14 @@
+---
+name: Feature Request
+about: Ask for a new feature
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+**Feature Proposed**
+<!-- describe the feature -->
+
+**Use Case**
+<!-- possible use case -->