message: update streamer readme
diff: -# Welcome to your CDK TypeScript project!
  +# The Dynamo Streamer
  -This is a blank project for TypeScript development with CDK.
  +This is from this [Tweet](https://twitter.com/edjgeek/status/1220227872511496192?s=20)
  -The `cdk.json` file tells the CDK Toolkit how to execute your app.
  +![Architecture](https://raw.githubusercontent.com/nideveloper/serverless/master/the-dynamo-streamer/img/arch.jpg)
  ## Useful commands
  