docs: diagram flow and make iso flow

docs/diagrams/make-iso-flow.puml

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+@startuml
+hide footbox
+skinparam shadowing false
+skinparam sequenceMessageAlign center
+skinparam responseMessageBelowArrow true
+skinparam ArrowColor #444444
+skinparam ParticipantBorderColor #666666
+skinparam ParticipantBackgroundColor #F8F8F8
+skinparam ActorBorderColor #666666
+skinparam ActorBackgroundColor #F8F8F8
+
+actor User
+participant "HISv3 Verifikasi" as HIS
+participant "DICOM ISO API" as API
+participant "PACS Server" as PACS
+participant "ISO Builder" as ISO
+
+User -> HIS: Click "Make ISO"
+HIS -> API: Request ISO by accession number
+API -> PACS: Find and retrieve DICOM study
+PACS --> API: Return DICOM files
+API -> ISO: Build ISO from DICOM files
+ISO --> API: ISO file ready
+API --> HIS: Return ISO download
+HIS --> User: User receives ISO file
+
+@enduml