feat: add a kustomize base to the repository

kustomize/README.md

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+This folder is a [kustomize application](https://kubectl.docs.kubernetes.io/references/kustomize/glossary/#application) that stands up a running instance of go-httpbin in a Kubernetes cluster.
+
+You may wish to utilise this as a [remote application](https://kubectl.docs.kubernetes.io/references/kustomize/kustomization/resource/), e.g.
+
+```yaml
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+commonLabels:
+  app.kubernetes.io/name: httpbin
+resources:
+  - github.com/mccutchen/go-httpbin/kustomize
+images:
+  - name: mccutchen/go-httpbin
+```
+
+To expose your instance to the interner, you could add an `Ingress` in an overlay:
+```yaml
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: httpbin
+spec:
+  ingressClassName: myingressname
+  rules:
+    - host: my-go-httpbin.com
+      http:
+        paths:
+          - path: /
+            pathType: Prefix
+            backend:
+              service:
+                name: httpbin
+                port:
+                  name: http
+  tls:
+   - hosts:
+       - my-go-httpbin.com
+     secretName: go-httpbin-tls
+```

kustomize/kustomization.yaml

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+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+commonLabels:
+  app.kubernetes.io/name: httpbin
+resources:
+  - resources.yaml
+images:
+  - name: mccutchen/go-httpbin

kustomize/resources.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: httpbin
+spec:
+  template:
+    spec:
+      containers:
+        - name: httpbin
+          image: mccutchen/go-httpbin
+          ports:
+            - name: http
+              containerPort: 8080
+              protocol: TCP
+          livenessProbe:
+            httpGet:
+              path: /status/200
+              port: http
+          readinessProbe:
+            httpGet:
+              path: /status/200
+              port: http
+          resources: {}
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: httpbin
+spec:
+  ports:
+    - port: 80
+      targetPort: http
+      protocol: TCP
+      name: http