Add pre-built AMIs to Terraform and update documentation

Terraform/terraform.tfvars.example

@@ -0,0 +1,6 @@
+region = "us-west-1"
+shared_credentials_file = "/home/user/.aws/credentials"
+public_key_name = "id_logger"
+public_key_path = "/home/user/.ssh/id_logger.pub"
+private_key_path = "/home/user/.ssh/id_logger"
+ip_whitelist = ["1.2.3.4/32"]