docs: Add example picture

Author: jim80net

README.md

@@ -5,7 +5,12 @@ and submits slowlog entry metrics to a Datadog account.
 
 [![semantic-release](https://img.shields.io/badge/%20%20%F0%9F%93%A6%F0%9F%9A%80-semantic--release-e10079.svg)](https://github.com/semantic-release/semantic-release)
 
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+![Example Datadog timeboard](images/elasticache-slowlog-to-datadog.png)
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 # lambda_function.rb
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 ## Usage
 
 This lambda function was built and tested with the `ruby-2.5` runtime.