Update Feature proposal.md with UX goal

.gitlab/issue_templates/Feature proposal.md

@@ -4,6 +4,12 @@
 
 <!-- What problem do we solve? Try to define the who/what/why of the opportunity as a user story. For example, "As a (who), I want (what), so I can (why/value)." -->
 
+### User experience goal
+
+<!-- What is the single user experience workflow this problem addresses? 
+For example, "The user should be able to use the UI/API/.gitlab-ci.yml with GitLab to <perform a specific task>"
+https://about.gitlab.com/handbook/engineering/ux/ux-research-training/user-story-mapping/ --> 
+
 ### Intended users
 
 <!-- Who will use this feature? If known, include any of the following: types of users (e.g. Developer), personas, or specific company roles (e.g. Release Manager). It's okay to write "Unknown" and fill this field in later.