Sequence-diagram.md

 Sequence diagram for the upload use case 
+Whole picture:  
 
 ![Skjermbilde_2020-03-21_kl._12.46.38](uploads/120835a98cf2cb44386214943701ddb7/Skjermbilde_2020-03-21_kl._12.46.38.png)
+  
+Diagram split into multiple pictures  
 
 ![Skjermbilde_2020-03-21_kl._12.48.08](uploads/906280974b3bdb0be49a28d9048bb4a2/Skjermbilde_2020-03-21_kl._12.48.08.png)
 
 ![Skjermbilde_2020-03-21_kl._12.48.21](uploads/d23a6e47ceef3ad5eee19fd1e504b2d5/Skjermbilde_2020-03-21_kl._12.48.21.png) 
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+
+![Skjermbilde_2020-03-21_kl._12.48.34](uploads/d3908686bd984f9bec1b7bf882ad3d95/Skjermbilde_2020-03-21_kl._12.48.34.png)
 
 [Requirements](https://gitlab.stud.idi.ntnu.no/gruppe-12/picturerama/-/wikis/Requirements)
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