feat: added mermaid seq diag to credentials page showing info flow

webapp/shop/cred/README.md

@@ -0,0 +1,21 @@
+```mermaid
+sequenceDiagram
+loop /your-exams 
+    ubuntu.com->>Skillable: /userrunningandsavedlabs?userid={userid}
+    Skillable-->>ubuntu.com: { RunningLabs[], SavedLabs[] }
+    ubuntu.com->>Skillable: /Result?labinstanceId={labinstanceId}
+    Skillable-->>ubuntu.com: { RunningLabs[], SavedLabs[] }
+end
+loop /take-exam
+    ubuntu.com->>Skillable: /launch?labid={labid}&userid={userid}
+    Skillable-->>ubuntu.com: {Url}
+    ubuntu.com->>Skillable: Redirect to Assessment Environment URL
+    Skillable-->>ubuntu.com: REDIRECT
+end
+loop /issue-badges
+    Skillable->>Skillable: Event == Scored
+    Note right of Skillable: Webhook!
+    Skillable->>ubuntu.com: { Id, UserExternalId, ExamPassed,LabProfileId }
+    ubuntu.com-->>Credly: {name, email, exam}
+end
+```