Adding readme.md

Author: harsh97

feature_store/apigw_terraform/README.md

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+This module handles opinionated Feature Store AuthN/AuthZ configuration using API Gateway on Oracle Cloud Infrastructure ([OCI][oci]). This stack is designed to be used with the [OCI Resource Manager][oci_rm] to enhance Feature store experience with AuthN/AuthZ in a single step. The stack can also be used with the [OCI Terraform Provider][oci_tf_provider] to deploy using local or CloudShell Terraform cli.
+
+## Deploy Using Oracle Resource Manager
+
+> ___NOTE:___ If you aren't already signed in, when prompted, enter the tenancy and user credentials. Review and accept the terms and conditions.
+
+1. Click to deploy the stack
+
+   [![Deploy to Oracle Cloud][magic_button]][magic_oke_stack]
+
+1. Select the region and compartment where you want to deploy the stack.
+
+1. Follow the on-screen prompts and instructions to create the stack.
+
+1. After creating the stack, click Terraform Actions, and select Plan.
+
+1. Wait for the job to be completed, and review the plan.
+
+1. To make any changes, return to the Stack Details page, click Edit Stack, and make the required changes. Then, run the Plan action again.
+
+1. If no further changes are necessary, return to the Stack Details page, click Terraform Actions, and select Apply.
+
+1. After the stack application is complete attach the auto-provisioned security rules to the respective service and node subnets of the OKE cluster. 
+
+### Prerequisites
+
+Create a terraform.tfvars file and populate with the required variables or override existing variables.
+
+Note: An example [tfvars file](examples/terraform.tfvars.example) is included for reference. Using this file is the
+preferred way to run the stack from the CLI, because of the large number of variables to manage.
+
+To use this file just copy the example [tfvars file](examples/terraform.tfvars.example) and save it in the outermost directory.
+Next, rename the file to __terraform.tfvars__. You can override the example values set in this file.
+
+
+### Running Terraform
+
+After specifying the required variables you can run the stack using the following commands:
+
+```bash
+terraform init
+```
+
+```bash
+terraform plan
+```
+
+```bash
+terraform apply
+```
+
+```bash
+terraform destroy -refresh=false
+```
+
+
+## License
+
+Copyright (c) 2021, 2024 Oracle and/or its affiliates.
+Released under the Universal Permissive License (UPL), Version 1.0.
+See [LICENSE](./LICENSE) for more details.
+
+[oci]: https://cloud.oracle.com/en_US/cloud-infrastructure
+[oci_rm]: https://docs.cloud.oracle.com/iaas/Content/ResourceManager/Concepts/resourcemanager.htm
+[magic_button]: https://oci-resourcemanager-plugin.plugins.oci.oraclecloud.com/latest/deploy-to-oracle-cloud.svg
+[magic_oke_stack]: https://cloud.oracle.com/resourcemanager/stacks/create?zipUrl=https://raw.githubusercontent.com/harsh97/oci-data-science-ai-samples/feature-store/feature_store/fs_apigw_terraform.zip