chores: add an Issues Template for handling User Stories

Author: ecarrenolozano

.github/ISSUE_TEMPLATE/user-story-template.md

@@ -0,0 +1,22 @@
+---
+name: User Story
+about: This template is for creating user stories
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**As a** [role]
+**I need** [function]
+**So that** [benefit]
+
+ ### Details and Assumptions
+* [document what you know]
+
+ ### Acceptance Criteria
+```gherkin
+Given [some preconditions]
+When [some event happens]
+Then [some outcome]
+```