chore: Add GitHub Settings (#173)

Author: osterman

.github/settings.yml

@@ -0,0 +1,7 @@
+# Upstream changes from _extends are only recognized when modifications are made to this file in the default branch.
+_extends: .github
+repository:
+  name: terraform-aws-rds
+  description: ' Terraform module to provision AWS RDS instances'
+  homepage: https://cloudposse.com/accelerate
+  topics: terraform, terraform-modules, rds, aws-rds, postgres, mysql, aws, hcl2