chore: update README.md (#639)

Add link to the new AWS SAM docs.

Author: mark-hirayama

README.md

@@ -10,12 +10,7 @@ This GitHub project is the starting point for AWS SAM. It contains the SAM speci
 
 The SAM specification and implementation are open sourced under the Apache 2.0 license. The current version of the SAM specification is available at [AWS SAM 2016-10-31](versions/2016-10-31.md).
 
-
-## Creating a serverless application using SAM
-To create a serverless application using SAM, first, you create a SAM template: a JSON or YAML configuration file that describes your Lambda functions, API endpoints and the other resources in your application. Then, you test, upload, and deploy your application using the [AWS SAM CLI](https://github.com/awslabs/aws-sam-cli). During deployment, SAM automatically translates your application’s specification into CloudFormation syntax, filling in default values for any unspecified properties and determining the appropriate mappings and invocation permissions to setup for any Lambda functions.
-
-[Read the How-To Guide](HOWTO.md) and see [examples](examples/) to learn how to define & deploy serverless applications using SAM.
-
+Documentation about using AWS SAM to define, test, and deploy serverless applications is available at [AWS Serverless Application Model Developer Guide](https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/what-is-sam.html).
 
 ## Contributing new features and enhancements to SAM
 You can build serverless applications faster and further simplify your development of serverless applications by defining new event sources, new resource types, and new parameters within SAM. Additionally, you can modify SAM to integrate it with other frameworks and deployment providers from the community for building serverless applications.