Added BDDs for Attestation Manager

features/attestation-manager/credentialDef/createCredentialDef.feature

+As an OCM user
+    I want to create a new Credential Definition
+
+Feature: Create a new Credential Definition
+        Create a new Credential Definition on Ledger and save details in DB
+
+    Scenario: Provide valid and required Credential Definition Details
+        Given I have passed all required credential definition details.
+        # src\credentialDef\controller\controller.ts -> REST API with POST method -> credentialDef/
+        When passed all valid credential definition details.
+        Then credential definition should be created on the Ledger with the given details.
+        And should return the newly created credential definition id.
+        And store the details in DB.
+        And I should get the HTTP status code 201 Created and the created Credential Definition Details.
+
+    Scenario: Provide invalid schemaID, name, created_by, is_revokable or is_auto_issue
+        Given I have passed schemaID, name, created_by, is_revokable and is_auto_issue.
+        # src\credentialDef\controller\controller.ts -> REST API with POST method -> credentialDef/
+        When  passed invalid schemaID, name, created_by, is_revokable or is_auto_issue.
+        Then  I should get HTTP status code 400 Bad Request.
+
+    Scenario: Provide name and schemaID of the existing Credential Definition.
+        Given I have passed all required credential definition details.
+        # src\credentialDef\controller\controller.ts -> REST API with POST method -> credentialDef/
+        When  passed name and schemaID of the existing Credential Definition.
+        Then  I should get HTTP status code 409 Conflict.
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