DOC-467 First pass of lake formation intro

Author: forstisabella

src/connections/storage/data-lakes/lake-formation-setup.md

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+---
+title: Lake Formation Setup
+---
+AWS Lake Formation is a fully managed service, built on top of Glue. It provides many features to securely build and manage a Data Lake backed by Glue. On the security front, Lake Formation adds a second level of fine-grained access on top of AWS IAM policies. These grant/revoke access-control works in conjunction with the IAM policies as shown in the following image: 
+
+To learn more about AWS Lake Formation, refer to the [Amazon Web Services documentation](https://docs.aws.amazon.com/lake-formation/latest/dg/access-control-overview.html).