Create aws_healthimaging.md (#449)

* Create aws_healthimaging.md

This is a new platform on AWS using MONAI deploy with native services like AWS HealthImaging and Amazon SageMaker

Signed-off-by: Gang Fu <ganfu@amazon.com>

* reorg file structure for new platform on AWS

* Update README.md

Added MAP to the link

Signed-off-by: David Bericat <dbericat@nvidia.com>

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Signed-off-by: Gang Fu <ganfu@amazon.com>
Signed-off-by: David Bericat <dbericat@nvidia.com>
Co-authored-by: Gang Fu <gangfu1982@gmai.com>
Co-authored-by: David Bericat <dbericat@nvidia.com>

Author: 3 people

platforms/aws_healthimaging/README.md

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+[AWS HealthImaging](https://aws.amazon.com/healthimaging/) (AHI) is a HIPAA-eligible, highly scalable, performant, and cost effective medical imagery store. 
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+We have developed a [MONAI Deploy connector](https://github.com/aws-samples/healthlake-imaging-to-dicom-python-module/tree/main) to AWS HealthImaging to integrate medical imaging AI applications with sub-second image retrieval latencies at scale powered by cloud-native APIs. 
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+The MONAI AI models and applications can be hosted on [Amazon SageMaker](https://aws.amazon.com/sagemaker/), which is a fully managed service to deploy Machine Learning (ML) models at scale. Amazon SageMaker takes care of setting up and managing instances for inference and provides built-in metrics and logs for endpoints that you can use to monitor and receive alerts. It also offers a variety of NVIDIA GPU instances for ML inference, as well as multiple model deployment options with automatic scaling, including real-time inference, serverless inference, asynchronous inference and batch transform.
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+The sample Jupyter notebooks in [this workshop](https://github.com/aws-samples/monai-on-aws-workshop) will walk you through how to deploy [MONAI Application Package (MAP)](https://github.com/Project-MONAI/monai-deploy/blob/main/guidelines/monai-application-package.md) on Amazon Sagemaker, which leverage the MONAI Deploy connector to retrieve image data from AHI and make AI prediction, as showned in this architecture diagram:
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+![MONAI Deploy Arch Diagram](monaideploy_arch.png)