add a example for haproxy_custom_configuration

examples/customization/custom-configuration/haproxy/README.md

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+# Customize the HAProxy configuration
+
+This example use a [ConfigMap](https://kubernetes.io/docs/user-guide/configmap/) to customize the HAProxy configuration.
+
+## Prerequisites
+
+This document has the following prerequisites:
+
+* Deploy a service named `ingress-default-backend` to be used as default backend service
+* Create a [TLS secret](/examples/PREREQUISITES.md#tls-certificates) named `tls-secret` to be used as default TLS certificate
+
+As mentioned in the deployment instructions, you MUST turn down any existing
+ingress controllers before running HAProxy Ingress.
+
+## Customize the HAProxy configuration
+
+Using a [ConfigMap](https://kubernetes.io/docs/user-guide/configmap/) is possible to customize the HAProxy configuration
+
+For example, if we want to change the timeouts we need to create a ConfigMap:
+
+```
+$ cat haproxy-load-balancer-conf.yaml
+apiVersion: v1
+data:
+  timeout http-request: "10s"
+  timeout connect: "10s"
+  timeout check: "10s"
+kind: ConfigMap
+metadata:
+  name: haproxy-load-balancer-conf
+```
+
+```
+$ kubectl create -f haproxy-load-balancer-conf.yaml
+```
+
+Please check the example `haproxy-custom-configuration.yaml`
+
+If the Configmap it is updated, HAProxy will be reloaded with the new configuration.

examples/customization/custom-configuration/haproxy/haproxy-custom-configuration.yaml

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+apiVersion: extensions/v1beta1
+kind: Deployment
+metadata:
+  labels:
+    run: haproxy-ingress
+  name: haproxy-ingress
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      run: haproxy-ingress
+  template:
+    metadata:
+      labels:
+        run: haproxy-ingress
+    spec:
+      containers:
+      - name: haproxy-ingress
+        image: quay.io/jcmoraisjr/haproxy-ingress
+        args:
+        - --default-backend-service=default/ingress-default-backend
+        - --default-ssl-certificate=default/tls-secret
+        - --configmap=haproxy-custom-configuration
+        ports:
+        - name: http
+          containerPort: 80
+        - name: https
+          containerPort: 443
+        - name: stat
+          containerPort: 1936
+        env:
+        - name: POD_NAME
+          valueFrom:
+            fieldRef:
+              fieldPath: metadata.name
+        - name: POD_NAMESPACE
+          valueFrom:
+            fieldRef:
+              fieldPath: metadata.namespace

examples/customization/custom-configuration/haproxy/haproxy-load-balancer-conf.yaml

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+apiVersion: v1
+data:
+  timeout http-request: "10s"
+  timeout connect: "10s"
+  timeout check: "10s"
+kind: ConfigMap
+metadata:
+  name: haproxy-custom-configuration