Added - README.md of service examples with magic button

Author: tf-oci-pub

examples/README.md

@@ -115,6 +115,8 @@ This directory contains Terraform configuration files showing how to create spec
     [![Deploy to Oracle Cloud](https://oci-resourcemanager-plugin.plugins.oci.oraclecloud.com/latest/deploy-to-oracle-cloud.svg)](https://cloud.oracle.com/resourcemanager/stacks/create?zipUrl=https://github.com/oracle/terraform-provider-oci/releases/latest/download/example_monitoring.zip)
 - mysql  
     [![Deploy to Oracle Cloud](https://oci-resourcemanager-plugin.plugins.oci.oraclecloud.com/latest/deploy-to-oracle-cloud.svg)](https://cloud.oracle.com/resourcemanager/stacks/create?zipUrl=https://github.com/oracle/terraform-provider-oci/releases/latest/download/example_mysql.zip)
+- network_firewall  
+    [![Deploy to Oracle Cloud](https://oci-resourcemanager-plugin.plugins.oci.oraclecloud.com/latest/deploy-to-oracle-cloud.svg)](https://cloud.oracle.com/resourcemanager/stacks/create?zipUrl=https://github.com/oracle/terraform-provider-oci/releases/latest/download/example_network_firewall.zip)
 - network_load_balancer  
     [![Deploy to Oracle Cloud](https://oci-resourcemanager-plugin.plugins.oci.oraclecloud.com/latest/deploy-to-oracle-cloud.svg)](https://cloud.oracle.com/resourcemanager/stacks/create?zipUrl=https://github.com/oracle/terraform-provider-oci/releases/latest/download/example_network_load_balancer.zip)
 - networking  

examples/network_firewall/README.md

@@ -0,0 +1,6 @@
+# Overview 
+This is a Terraform configuration that creates the `network_firewall` service on Oracle Cloud Infrastructure. 
+
+The Terraform code is used to create a Resource Manager stack, that creates the required resources and configures the application on the created resources.
+## Magic Button 
+[![Deploy to Oracle Cloud](https://oci-resourcemanager-plugin.plugins.oci.oraclecloud.com/latest/deploy-to-oracle-cloud.svg)](https://cloud.oracle.com/resourcemanager/stacks/create?zipUrl=https://github.com/oracle/terraform-provider-oci/releases/latest/download/example_network_firewall.zip)