docs(registration): add activity flow diagram (#404)

Author: MaximilianHauer

docs/developer/01. Registration/01. Registration Process/01. Registration Flow Activity Diagram.md

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+# Registration Flow - Activity Diagram
+
+## Activity Diagram
+
+```mermaid
+
+flowchart TD
+
+    Start((Start)) -->|Success| VerifyReg[VERIFY_REGISTRATION]
+
+    VerifyReg[VERIFY_REGISTRATION] -->|Success| CreateBPNNPush[CREATE_BUSINESS_PARTNER_NUMBER_PUSH]
+
+    CreateBPNNPush -->|Success| CreateBPNNManual[CREATE_BUSINESS_PARTNER_NUMBER_MANUAL]
+
+    CreateBPNNManual -->|Success| CreateBPNNPull[CREATE_BUSINESS_PARTNER_NUMBER_PULL]
+
+    CreateBPNNPull -->|Success| CreateDimWallet[CREATE_DIM_WALLET]
+
+    CreateDimWallet -->|Success| AwaitDimResponse[AWAIT_DIM_RESPONSE]
+
+    subgraph AwaitDimResponse
+
+        ValidateSchema[Validate DID Document Schema]
+
+        PublishPublic[Publish DID Document Publicly]
+
+    end
+
+    AwaitDimResponse -->|Success| ValidateDidDoc[VALIDATE_DID_DOCUMENT]
+
+    ValidateDidDoc -->|Success| TransmitBPNDID[TRANSMIT_BPN_DID]
+
+    subgraph TransmitBPNDID
+
+        StoreDIDLocBPNL[Store DID Document Location with BPNL in BDRS Service]
+
+    end
+
+    TransmitBPNDID -->|Success| RequestBPNCred[REQUEST_BPN_CREDENTIAL]
+
+    RequestBPNCred -->|Success| StoredBPNCred[STORED_BPN_CREDENTIAL]
+
+    StoredBPNCred -->|Success| RequestMemCred[REQUEST_MEMBERSHIP_CREDENTIAL]
+
+    subgraph RequestMemCred
+
+        InterfaceIssuer[Interface to Issuer Component]
+
+        IssueWithWallet[Issuance with Wallet]
+
+    end
+
+    RequestMemCred -->|Success| StoredMemCred[STORED_MEMBERSHIP_CREDENTIAL]
+
+    StoredMemCred -->|Success| StartClearing[START_CLEARING_HOUSE]
+
+    StartClearing -->|Success| EndClearing[END_CLEARING_HOUSE]
+
+    EndClearing -->|Validation Error| TriggerOverride[TRIGGER_OVERRIDE_CLEARING_HOUSE]
+
+    EndClearing -->|No Error| StartSelfDescLP[START_SELF_DESCRIPTION_LP]
+
+    StartSelfDescLP -->|Success| EndSelfDescLP[END_SELF_DESCRIPTION_LP]
+
+    EndSelfDescLP -->|Error| RetriggerSelfDescLP[RETRIGGER_SELF_DESCRIPTION_LP]
+
+    EndSelfDescLP -->|Success| Finish(APPLICATION_ACTIVATION)
+
+    TriggerOverride -->|Success| StartSelfDescLP
+
+    RetriggerSelfDescLP -->|Success| Finish
+
+    VerifyReg --> DeclineReg["Decline Registration"]:::declineProcess --> Declined((DECLINED))
+
+    CreateBPNNPush -->|Error| DeclineReg
+    CreateBPNNManual -->|Error| DeclineReg
+    CreateBPNNPull -->|Error| DeclineReg
+    CreateDimWallet -->|Error| DeclineReg
+    AwaitDimResponse -->|Error| DeclineReg
+    ValidateDidDoc -->|Error| DeclineReg
+    TransmitBPNDID -->|Error| DeclineReg
+    RequestBPNCred -->|Error| DeclineReg
+    StoredBPNCred -->|Error| DeclineReg
+    RequestMemCred -->|Error| DeclineReg
+    StoredMemCred -->|Error| DeclineReg
+    StartClearing -->|Error| DeclineReg
+    EndClearing -->|Error| DeclineReg
+    StartSelfDescLP -->|Error| DeclineReg
+    EndSelfDescLP -->|Error| DeclineReg
+    TriggerOverride -->|Error| DeclineReg
+    RetriggerSelfDescLP -->|Error| DeclineReg
+```
+
+## NOTICE
+
+This work is licensed under the [Apache-2.0](https://www.apache.org/licenses/LICENSE-2.0).
+
+- SPDX-License-Identifier: Apache-2.0
+- SPDX-FileCopyrightText: 2024 Contributors to the Eclipse Foundation
+- Source URL: https://github.com/eclipse-tractusx/portal-assets