Merge branch 'simple_issue_template' into 'master'

Story.md issue template

See merge request flatland/flatland!241

.gitlab/issue_templates/Story.md

+### Story
+As a **ROLE**, I want **WHAT** so that **PURPOSE**.
+
+### Acceptance Criteria
+- Item 1
+- Item 2
+- Documentation Item 1
+- Documentation Item 2