Add warning note to mlp_sdk_v3 README

Added a warning note about the mlp_sdk_v3 example's purpose and usage.

Author: rvvittal

platform/mlp-sdk-v3/README.md

@@ -1,3 +1,6 @@
+> [!WARNING]
+> This mlp_sdk_v3 example demonstrates how to develop an ML Platform SDK wrapper library, providing a way to simplify infrastructure management and maintain consistent machine learning development practices across teams. It is intended as a reference guide for customers to help them create their own customized SDK wrappers. Note: This library is provided for illustrative purposes only and should not be used directly in production environments.
+> 
 # mlp_sdk_v3
 
 A Python wrapper library for SageMaker SDK v3 with configuration-driven defaults.
@@ -513,4 +516,4 @@ python examples/xgboost_training_script.py --wait
 
 # Run XGBoost training (notebook)
 jupyter notebook examples/xgboost_training_example.ipynb
-```
+```