Define an interface to accept collection of cm handles for Get operation.

 - Added REST endpoint (Not Implemented yet)
 - Created unit test

Issue-ID: CPS-1555
Change-Id: I24ce8d663602c08cc207f4657289631439d3fb9e
Signed-off-by: leventecsanyi <levente.csanyi@est.tech>
diff --git a/openapi/components.yml b/openapi/components.yml
index 1e35c02..2bddd8b 100644
--- a/openapi/components.yml
+++ b/openapi/components.yml
@@ -1,5 +1,5 @@
 #  ============LICENSE_START=======================================================
-#  Copyright (C) 2021-2022 Nordix Foundation
+#  Copyright (C) 2021-2023 Nordix Foundation
 #  Modifications Copyright (C) 2022 Bell Canada
 #  ================================================================================
 #  Licensed under the Apache License, Version 2.0 (the "License");
@@ -164,6 +164,16 @@
             status: 500
             message: Internal Server Error
             details: Internal Server Error occured
+    NotImplemented:
+      description: Not Implemented
+      content:
+        application/json:
+          schema:
+            $ref: '#/components/schemas/ErrorMessage'
+          example:
+            status: 501
+            message: Not Implemented
+            details: Method Not Implemented
   parameters:
     cmHandleInPath:
       name: cmHandle