Added README

Author: robbytaylor

README.md

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+# Terraform API Gateway Lambda module
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+This Terraform module creates an AWS API Gateway with Lambda proxy itegration and, optional, custom domain.
+
+Use this module to easily deploy a NodeJS application to AWS.
+
+For an example of using this module, see https://github.com/robbytaylor/slack-secret-message/blob/master/terraform/main.tf