Update Use case authored by Diderik Kramer's avatar Diderik Kramer
Use case diagram
![Use_Case_for_Picturerama__1_](uploads/50ef2d40675aca58ee27d601bdaa8648/Use_Case_for_Picturerama__1_.png)
![Use_Case_for_Picturerama__3_](uploads/e68d465708c66b01aa535d3b3d299c99/Use_Case_for_Picturerama__3_.png)
[Requirements](https://gitlab.stud.idi.ntnu.no/gruppe-12/picturerama/-/wikis/Requirements)
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