message: add x-ray tracer to main readme
diff: @@ -165,6 +165,13 @@ npx cdk deploy
  <br /><hr /><br />
  + #### [The X-Ray Tracer](the-xray-tracer/README.md)
  + Learn about using AWS X-Ray for tracing events through your system. This pattern has X-Ray enabled on API Gateway, Lambda, DynamoDB, External HTTP calls, SNS and SQS
  +
  + ![Architecture](the-xray-tracer/img/arch.png)
  +
  + <br /><hr /><br />
  +
  </details>
  <details>
  <summary>
  @@ -303,6 +310,11 @@ npx cdk deploy
  ![Architecture](the-destined-lambda/img/arch.png)
  + #### [The X-Ray Tracer](the-xray-tracer/README.md)
  + Learn about using AWS X-Ray for tracing events through your system. This pattern has X-Ray enabled on API Gateway, Lambda, DynamoDB, External HTTP calls, SNS and SQS
  +
  + ![Architecture](the-xray-tracer/img/arch.png)
  +
  <br /><hr /><br />
  ### Thorsten Hoeger
  @@ -371,7 +383,8 @@ I will now group patterns by their relevant pillar:
  The [operational excellence pillar](https://d1.awsstatic.com/whitepapers/architecture/AWS-Serverless-Applications-Lens.pdf#page=28) includes the ability to run and monitor systems to deliver business value and to continually improve supporting processes and procedures.
  #### [The X-Ray Tracer](the-xray-tracer/README.md)
  - A system with X-Ray enabled containing API Gateway, Lambda, DynamoDB, External HTTP calls, SNS and SQS
  + Learn about using AWS X-Ray for tracing events through your system. This pattern has X-Ray enabled on API Gateway, Lambda, DynamoDB, External HTTP calls, SNS and SQS
  +
  ![Architecture](the-xray-tracer/img/arch.png)
  <br /><hr /><br />
  