Add user story issues template

.github/ISSUE_TEMPLATE/user_story.md

@@ -0,0 +1,16 @@
+---
+name: User Story
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+As a _[role or persona]_, I want _[goal/ need]_ so that _[why]_
+
+**Feature:** _[Brief description of feature]_
+
+_[Any additional descriptions on feature]_
+
+**Scenario:** Please use _[Gherkin](https://cucumber.io/docs/gherkin/reference/)_ here