fix: diagram w/ key/val cache and acknowledgement

Author: shawnhankim

README.md

@@ -16,6 +16,10 @@ TBD
 
 Please see the [contributing guide](https://github.com/nginxinc/nginx-aws-signature/blob/main/CONTRIBUTING.md) for guidelines on how to best contribute to this project.
 
+## Authors and acknowledgment
+
+This project was inspired the on the great work by [nginx-s3-gateway](https://github.com/nginxinc/nginx-s3-gateway) and [nginx-serverless](https://github.com/nginx-serverless).
+
 ## License
 
 [Apache License, Version 2.0](https://github.com/nginxinc/nginx-aws-signature/blob/main/LICENSE)