add breaking change message

Author: Mai Nguyen (from Dev Box)

src/acrtransfer/azext_acrtransfer/_breaking_change.py

@@ -0,0 +1,15 @@
+# --------------------------------------------------------------------------------------------
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License. See License.txt in the project root for license information.
+# --------------------------------------------------------------------------------------------
+
+from azure.cli.core.breaking_change import register_logic_breaking_change
+
+register_logic_breaking_change('acr export-pipeline create', 'Add required parameter --storage-access-mode',
+                               detail='A new required parameter `--storage-access-mode` will be added. '
+                                      'Allowed values: `entra-mi-auth`, `storage-sas-token`.')
+
+
+register_logic_breaking_change('acr import-pipeline create', 'Add required parameter --storage-access-mode',
+                               detail='A new required parameter `--storage-access-mode` will be added. '
+                                      'Allowed values: `entra-mi-auth`, `storage-sas-token`.')