Add diagram and description to fruits pipeline worker readme

Author: andrewMacmurray

examples/fruits-pipeline-worker/README.md

@@ -2,6 +2,17 @@
 
 A fruit picking worker process that talks to AWS services.
 
+### Steps:
+
+1. The worker polls an SQS queue for messages which contain the location of the fruit trees (S3).
+2. The worker then loads the data for the fruit trees from S3 and harvests the fruit (i.e. runs some logic).
+3. The harvests are then saved in an S3 bucket.
+4. The worker publishes an SNS message which can then be picked up by external servives.
+
+![fruits-worker](./images/fruits-worker.png)
+
+## Run it locally
+
 Add the env vars to your shell:
 
 ```