Updated readme.md

Author: unamachi

README.md

@@ -58,6 +58,7 @@
 
    <li> <a href = "/cd3_automation_toolkit/documentation/user_guide/RestructuringOutDirectory.md">Grouping of generated Terraform files</a></li>
    <li> <a href = "/cd3_automation_toolkit/documentation/user_guide/learn_more/ResourceManagerUpload.md">OCI Resource Manager Upload</a></li>
+   <li> <a href = "/cd3_automation_toolkit/documentation/user_guide/learn_more/OPAForCompliance.md">OPA For Compliance with Terraform</a></li>
    <li> <a href = "/cd3_automation_toolkit/documentation/user_guide/learn_more/CISFeatures.md">Additional CIS Compliance Features</a></li>
    <li> <a href = "/cd3_automation_toolkit/documentation/user_guide/learn_more/SupportForCD3Validator.md">CD3 Validator Features</a></li>