Add enhancement issue template

.github/ISSUE_TEMPLATE/enhancement.md

@@ -0,0 +1,23 @@
+---
+name: Enhancement / Feature Request
+about: Suggest a new capability
+title: 'Feature Request: '
+labels: enhancement
+assignees: ''
+
+---
+
+**Summary:**
+What the new capability is.
+
+**How important this is to me and why:**
+
+Importance: High/Medium/Low
+
+Use cases:
+1.
+2.
+3.
+
+**Additional context / similar features:**
+Any examples of good implementations of this capability.