Add usage example

Partially addresses #8

README.md

@@ -9,6 +9,104 @@ The following requests are supported:
 
 Since the proxy is stateless, it can be scaled horizontally. Multiple replicas can be used to ensure uptime during deployments and handle pod failure.
 
+The proxy can be deployed to a Kubernetes namespace running Jupyterhub by applying the following config:
+Change SUB_DOMAIN_HOST to a value to a hostname where jupyterhub is hosted.
+
+```yaml
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  labels:
+    app: jupyterhub
+    component: proxy
+  name: proxy
+spec:
+  replicas: 3
+  revisionHistoryLimit: 1
+  selector:
+    matchLabels:
+      app: jupyterhub
+      component: proxy
+  strategy:
+    type: RollingUpdate
+  template:
+    metadata:
+      labels:
+        app: jupyterhub
+        component: proxy
+    spec:
+      affinity:
+        podAntiAffinity:
+          preferredDuringSchedulingIgnoredDuringExecution:
+          - podAffinityTerm:
+              labelSelector:
+                matchExpressions:
+                - key: name
+                  operator: In
+                  values:
+                  - proxy
+              topologyKey: kubernetes.io/hostname
+            weight: 100
+      containers:
+      - command:
+        - /proxy/jupyterhub-istio-proxy
+        env:
+        - name: CONFIGPROXY_AUTH_TOKEN
+          valueFrom:
+            secretKeyRef:
+              key: proxy.token
+              name: hub-secret
+        - name: ISTIO_GATEWAY
+          value: istio-gateway/jupyterhub-gateway
+        - name: K8S_NAMESPACE
+          valueFrom:
+            fieldRef:
+              fieldPath: metadata.namespace
+        - name: SUB_DOMAIN_HOST
+          value: example.com
+        - name: VIRTUAL_SERVICE_PREFIX
+          value: jupyterhub
+        - name: WAIT_FOR_WARMUP
+          value: "true"
+        image: splunk/jupyterhub-istio-proxy:v0.0.1
+        imagePullPolicy: IfNotPresent
+        name: proxy
+        ports:
+        - containerPort: 8000
+          name: proxy-public
+          protocol: TCP
+        resources:
+          limits:
+            cpu: "1"
+            memory: 256M
+          requests:
+            cpu: 100m
+            memory: 256M
+        securityContext:
+          allowPrivilegeEscalation: false
+      nodeSelector: {}
+      securityContext:
+        runAsNonRoot: true
+      terminationGracePeriodSeconds: 60
+
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: proxy-api
+spec:
+  ports:
+  - name: http-proxy-api
+    port: 80
+    protocol: TCP
+    targetPort: 8000
+  selector:
+    component: proxy
+  type: ClusterIP
+
+```
+
 # Testing setup
 
 https://github.com/golang/mock is used for creating mocks for testing.