Update README.md

Author: bonclay7

modules/workloads/infra/README.md

@@ -6,6 +6,8 @@ This module provides EKS cluster monitoring with the following resources:
 - AWS Managed Grafana Dashboard and data source
 - Alerts and recording rules with AWS Managed Service for Prometheus
 
+This module is inspired from the open source [kube-prometheus-stack](https://github.com/prometheus-community/helm-charts/tree/main/charts/kube-prometheus-stack)
+
 <!-- BEGINNING OF PRE-COMMIT-TERRAFORM DOCS HOOK -->
 ## Requirements