[skip ci] Add DB-specific readme's

modules/cloud-sql/README-MySQL.md

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+<!--
+:type: service
+:name: MySQL
+:description: Deploy and manage MySQL on GCP using Google's Cloud SQL Service
+:icon: /_docs/mysql.png
+:category: database
+:cloud: gcp
+:tags: data, database, sql, mysql
+:license: open-source
+:built-with: terraform
+-->
+# MySQL
+[![Maintained by Gruntwork.io](https://img.shields.io/badge/maintained%20by-gruntwork.io-%235849a6.svg)](https://gruntwork.io/?ref=repo_google_cloudsql)
+[![GitHub tag (latest SemVer)](https://img.shields.io/github/tag/gruntwork-io/terraform-google-sql.svg?label=latest)](http://github.com/gruntwork-io/terraform-google-sql/releases/latest)
+![Terraform Version](https://img.shields.io/badge/tf-%3E%3D0.12.0-blue.svg)
+
+This module deploys MySQL on top of Google's Cloud SQL Service. The cluster is managed by GCP and automatically handles 
+standby failover, read replicas, backups, patching, and encryption.
+
+[README.md](./README.md)

modules/cloud-sql/README-PostgreSQL.md

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+<!--
+:type: service
+:name: PostgreSQL
+:description: Deploy and manage PostgreSQL on GCP using Google's Cloud SQL Service
+:icon: /_docs/postgresql.png
+:category: database
+:cloud: gcp
+:tags: data, database, sql, postgresql
+:license: open-source
+:built-with: terraform
+-->
+# PostgreSQL
+[![Maintained by Gruntwork.io](https://img.shields.io/badge/maintained%20by-gruntwork.io-%235849a6.svg)](https://gruntwork.io/?ref=repo_google_cloudsql)
+[![GitHub tag (latest SemVer)](https://img.shields.io/github/tag/gruntwork-io/terraform-google-sql.svg?label=latest)](http://github.com/gruntwork-io/terraform-google-sql/releases/latest)
+![Terraform Version](https://img.shields.io/badge/tf-%3E%3D0.12.0-blue.svg)
+
+This module deploys PostgreSQL on top of Google's Cloud SQL Service. The cluster is managed by GCP and automatically handles 
+standby failover, read replicas, backups, patching, and encryption.
+
+[README.md](./README.md)