Create README.md

Add section for WAF

Author: ocisec

cloud-infrastructure/infrastructure-security/waf/README.md

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+# OCI Web Application Firewall (WAF)
+ 
+Oracle Cloud Infrastructure Web Application Firewall (WAF) is a cloud-based, PCI-compliant, global security service that protects applications from malicious and unwanted internet traffic. Oracle Cloud Infrastructure WAF can protect any internet-facing endpoint, providing consistent rule enforcement across a customer's applications. 
+
+# Table of Contents
+ 
+1. [Useful Links](#useful-uinks)
+  
+ 
+## Useful Links
+ 
+- [OCI WAF Overview)(https://www.oracle.com/uk/security/cloud-security/web-application-firewall/)
+    - OCI WAF Overview
+
+- [OCI WAF Documentation)(https://docs.oracle.com/en-us/iaas/Content/WAF/Concepts/overview.htm)
+    - OCI WAF documentation
+
+- [OCI WAF FAQ)(https://www.oracle.com/uk/security/cloud-security/web-application-firewall/faq/)
+    - OCI WAF response to frequently asked questions
+  
+- [OCI WAF Best Practices)(https://docs.oracle.com/en-us/iaas/Content/Security/Reference/waf_security.htm#securing_waf)
+    - Security information and recommendations for Web Application Firewall (WAF).
+ 
+# License
+ 
+Copyright (c) 2023 Oracle and/or its affiliates.
+ 
+Licensed under the Universal Permissive License (UPL), Version 1.0.
+ 
+See [LICENSE](https://github.com/oracle-devrel/technology-engineering/blob/folder-structure/LICENSE) for more details.