Update out-of-band-sequence.md

aw-design-diagram/out-of-band-sequence.md

+```mermaid
 sequenceDiagram
 participant PCM User
 participant PCM App
@@ -12,3 +13,4 @@ participant OCM Proof Manager
  PCM App ->> OCM Proof Manager: Sends the requested attributes, if proof verification is successful it sets isVerified as true and state as done in the database.
  OCM Admin ->> OCM Proof Manager: Calls Get method find-by-presentation-id API, against the presentation-id of proof request, and confirms the status of isVerified and state.
  end
+```