usecases.md

+# Use cases 
+
+## Create questionnaire entities
+![Usecases_for_questionnaire_editor-UC_1__Creation_of_new_questionnaires](/uploads/973421f6098c0fc83ca2480185bb4ed8/Usecases_for_questionnaire_editor-UC_1__Creation_of_new_questionnaires.png)
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