[5] As a user, i want an option to hide read articles from the feed

Add filter option to hide already read articles from the main feed

ToDo

Custom:

• Add changing button to view/hide read articles next to settings icon in main view
• Expand "ArticleList"-View to only show read articles if the button has the fitting state

Defaults:

• Report Changes in UML
• Report Changes in Wireframes

Acceptance criteria

Custom:

• Read articles do not show up in main feed

Defaults:

• Naming Convention for Classes, Functions and Variables are met
• Comments are sufficient

Effort:

5