Sequence-diagram.md

 [Requirements](Requirements)  
-Sequence diagram for the upload use case 
+Sequence diagram for the upload use case
+
+![Sequence_diagram](uploads/3c7f4cdd207fb5a2f9fe069833b6e1ba/Sequence_diagram.png)
+ 
 Whole picture:  
 
 ![Skjermbilde_2020-03-21_kl._12.46.38](uploads/120835a98cf2cb44386214943701ddb7/Skjermbilde_2020-03-21_kl._12.46.38.png)