Create CHANGELOG.md sagemaker-train

Author: rsareddy0329

sagemaker-train/CHANGELOG.md

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+# Changelog
+
+## v1.1.1 (2025-12-10)
+
+### Bug fixes and Other Changes
+* Add validation to bedrock reward models
+* Hyperparameter issue fixes, Add validation s3 output path
+* Fix the recipe selection for multiple recipe scenario
+* Train wait() timeout exception handling
+* Update example notebooks to reflect recent code changes
+* Update `model_package_group_name`  param to `model_package_group`  in finetuning interfaces
+* remove `dataset` param for benchmark evaluator
+
+## v1.1.0 (2025-12-03)
+
+### Features
+
+* Fine-tuning SDK: SFT, RLVR, and RLAIF techniques with standardized parameter design
+* AIRegistry Integration: Added CRUD operations for datasets and evaluators
+* Enhanced Training Experience: Implemented MLFlow metrics tracking and deployment workflows
+
+## v1.0.1 (2025-11-19)
+
+* Update project dependencies to include submodules: sagemaker-core, sagemaker-train, sagemaker-serve, sagemaker-mlops
+