feat: add principal manager bdds

features/principal-manager/principalManager.feature

+Feature: Offer membership credentials
+         Offer the membership credentials to the holder when the connection is in complete state 
+
+Scenario: Process connection request when status is complete   
+Given the connection status as complete
+# Controller.ts -> connectionComplete
+When I evaluate status as complete
+# Nats -> 'ATTESTATION_MANAGER_SERVICE/offerMemberShipCredentials'
+Then I called the offer membership credentials (attestation service)
+And get a successful response
+Then sends the response with message status connection received
+
+Scenario: Process connection request when status is other than complete
+Given the connection status other than complete
+# Controller.ts -> connectionComplete
+When I evaluate status as not complete
+Then sends the response with message connection status should be Complete