Add initial scaffold for OCI Identity Domains SMS Enrollment reference implementation

oci-and-db/foundation/cloud-security/iam/identity-domains-sms-enrollment/README.md

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+# OCI Identity Domains – SMS Enrollment Reference Implementation
+
+## Overview
+
+This repository accompanies the Oracle Blog:
+
+**Verify Phone Numbers During User Registration Without Adding Friction to Sign-In**
+
+It demonstrates how to implement phone number verification during user registration using Oracle Cloud Infrastructure (OCI) Identity Domains and the public Identity Domains REST APIs.
+
+Rather than enforcing SMS during every authentication, this solution uses SMS solely to verify ownership of the mobile number during onboarding while allowing organizations to enforce Multi-Factor Authentication (MFA) later through Identity Domains Sign-On Policies.
+
+## Repository Contents
+
+This repository contains:
+
+- Architecture diagrams
+- End-to-end API workflow
+- OAuth token acquisition examples
+- REST API examples
+- cURL samples
+- Postman collection
+- Sample implementations
+- Troubleshooting guidance
+
+## Architecture
+
+Coming soon.
+
+## REST Examples
+
+Coming soon.
+
+## Postman Collection
+
+Coming soon.
+
+## Sample Code
+
+Coming soon.