README update for configuring HAProxy (#30)

Author: barkhachoithani

README.md

@@ -69,4 +69,36 @@ helm upgrade marklogic-operator ./charts/marklogic-operator --install --namespac
 Once MarkLogic Operator is installed, go to config/samples folder and pick one sample file to deploy. For example, to deploy marklogic single group, use the following script: 
 ```sh
 kubectl apply -f marklogicgroup.yaml
-```
+```
+
+### Configure HAProxy Load Balancer
+HAProxy is provided as a load balancer configured to support cookie-based session affinity and multi-statement transactions. These configurations are needed by some MarkLogic client applications, like mlcp. HAProxy is recommended for production workloads. 
+
+#### Enable the HAProxy Load Balancer
+The HAProxy Load Balancer is disabled by default. To enable it, provide the following configuration in the crd yaml file to be used for cluster creation:
+```
+haproxy:
+    enabled: true
+```
+#### Configuration
+HAProxy can be configured for cluster and group. By default, ports 8000, 8001, and 8002 are configured to handle HTTP traffic. 
+Ports can be configured for additional app servers. For example, to add port 8010 for HTTP load balancing, add this configuration to the marklogicgroup.yaml file:
+```
+- name: my-app-1     
+      type: HTTP
+      port: 8010
+      targetPort: 8010
+```
+#### Access HA Proxy
+The HAProxy can be accessed from a service with the name of marklogic-haproxy. 
+
+#### External access
+By default, HAProxy is configured to provide access within the Kubernetes cluster. However, HAProxy can provide external access by setting the service type in the marklogicgroup.yaml file:
+```
+haproxy:  
+  service:    
+    type: LoadBalancer
+```
+
+> [!WARNING]
+> Please note, by setting the haproxy service type to LoadBalancer, the MarkLogic endpoint is exposed to the public internet. Because of this, networkPolicy should be set to limit the sources that can visit MarkLogic.