Change User specific theme

[DimitriB01]

User Story
As a student i want to be able to choose a course-theme.

Acceptance criteria

• At least 2 course-themes are created
• At least 2 course-themes can be selected
• Selected theme is saved
• Saved theme is applied to the individual user, upon loading the HASKI-course

Definition of Ready

• User Story is small enough for Sprint
• User Story is clearly understandable for everyone involved
• User Story has acceptance criteria
• User Story has added value for the product or development
• User Story origin is known (stakeholder)
• User Story is assigned to Release
• Backend and Frontend are cloned from GitHub and Running locally
• Basic knowledge of the backend and frontend architecture
• Activity diagram (or sequence diagram) screenshot in issue
• User Story effort is estimated

Definition of Done

• All acceptance criteria are met
• The implementation of the User Story has been successfully accepted by the Product Owner
• The implementation is in GitHub
• A code review has been performed (or created in pairing program)
• Code conventions are followed
• Unit test coverage must be greater than 90%
• All tests must have passed
• Technical documentation created (Feature documented in GitHub Wiki)
• UML class diagrams and component diagrams created and up-to-date
• Documentation in realization created (source code)
• Changelog created (Clear description in merge request)
• There are no known bugs