+@startuml class-diagram.png
+skinparam handwritten true
+skinparam monochrome true
+skinparam packageStyle rect
+skinparam defaultFontName FG Virgil
+skinparam shadowing false
+
+actor User
+participant ContactsPresenter
+participant AddContactEvent
+participant AddContactEventHandler
+participant ContactHashMapObject
+
+User ->> ContactsPresenter : "Select ADD button"
+User ->> AddContactEvent : "ADD new contact"
+ContactsPresenter ->> AddContactEventhandler : onAddContact(ids)
+
+loop foreach id in ids
+	AddContactEvent --> AddContactEvent : onAddContact(id)
+	AddContactEvent ->> ContactHashMapObject : Add(id)
+end
+
+@enduml