Add amazonsagemaker usecase templates

[karthika1205]

1. Use Amazon SageMaker to classify inbound documents and create ServiceNow incidents or Salesforce cases or Coupa invoices
2. Classify new Salesforce leads as Hot or Warm or Cold using Amazon SageMaker then update probability and create a task
3. a. Retrieve customer usage support and billing data from Amazon S3 then invoke SageMaker for churn probability scoring
   b. Process SageMaker inference results to write churn scores to Salesforce and alert high-risk accounts via MS Teams alerts

[Deepak-Ayilliath]

Made corrections. LGTM now.