Update issue templates

Author: YuriMascarenhasLourenco

.github/ISSUE_TEMPLATE/user-story.md

@@ -0,0 +1,19 @@
+---
+name: User story
+about: Describe this issue template's purpose here.
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**As a** [role]
+**I need** [function]
+**So that** [benefit]
+### Details and Assumptions
+    * [document what you know]
+### Acceptance Criteria
+    gherkin
+    Given [some context]
+    When [certain action is taken]
+    Then [the outcome of action is observed]