adding mycredential document metadata

Reviewed-by: gtema <artem.goncharov@gmail.com>
Co-authored-by: Hasko, Vladimir <vladimir.hasko@t-systems.com>
Co-committed-by: Hasko, Vladimir <vladimir.hasko@t-systems.com>

otc_metadata/data/services.yaml

@@ -494,6 +494,13 @@ documents:
     service_type: iam
     title: User Guide
     type: umn
+  - hc_location: usermanual/ac
+    link: /identity-access-management/mycredential/
+    pdf_name: iam-mycredential-guide
+    rst_location: doc/mycredential/source
+    service_type: iam
+    title: My Credential
+    type: mycredential
   - hc_location: api/ims
     html_location: docs/ims/api-ref
     link: /image-management-service/api-ref/