feat: Add Identity Hub concepts documentation

developer/wip/for-adopters/issuance-flow.puml

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+@startuml
+!pragma layout smetana
+
+!include diagram.styles.puml
+
+autonumber
+
+box "Participant"
+participant "Client" as C
+participant "Identity Hub" as IH
+end box
+
+box "Issuer"
+participant "Issuer Service(s)" as IS #FFF4B3
+end box
+
+C -> IH: Initiate process
+IH -> IS: Request Credential using Self-Issued ID token
+IS -> IH: (async) )Write Membership Credential
+
+
+@enduml

developer/wip/for-adopters/token-use.puml

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+@startuml
+!pragma layout smetana
+
+!include diagram.styles.puml
+
+autonumber
+
+box "Data Consumer"
+participant "Connector" as C
+participant "Identity Hub" as IH
+end box
+
+box "Data Provider"
+participant "Connector" as PC
+end box
+
+C -> IH: SI token request
+IH -> C: Token response w/ access token
+
+C-> PC: Request w/ si token and access token
+PC-> IH: request w/ access token
+IH ->PC: VP response
+@enduml