added header

Signed-off-by: Patrick Assuied <[email protected]>

Author: passuied

ext/dapr-ext-workflow/dapr/ext/workflow/aio/__init__.py

@@ -1,5 +1,18 @@
 # -*- coding: utf-8 -*-
 
+"""
+Copyright 2025 The Dapr Authors
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+    http://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+"""
+
 from .dapr_workflow_client import DaprWorkflowClient
 
 __all__ = [