Add traefik v2 kubernetes examples

Ref #72 #89 #92

examples/traefik-v2/kubernetes/simple-separate-pod/README.md

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+
+# Kubernetes - Simple Separate Pod Example
+
+This is a simple example of how to deploy traefik-forward-auth in it's own pod with minimal configuration. This example is a good starting point for those who already have traefik deployed (e.g. using helm).
+
+This example uses [Individual Authentication](https://github.com/thomseddon/traefik-forward-auth/blob/master/README.md#individual-ingress-authentication-in-kubernetes) to apply forward authentication to selected ingresses. This means ingresses will not be protected by default. Authentication can be applied by adding the `traefik-forward-auth` middleware, for example:
+
+```
+apiVersion: traefik.containo.us/v1alpha1
+kind: IngressRoute
+metadata:
+  name: whoami
+  labels:
+    app: whoami
+spec:
+  entryPoints:
+    - http
+  routes:
+  - match: Host(`whoami.example.com`)
+    kind: Rule
+    services:
+      - name: whoami
+        port: 80
+    middlewares:
+      - name: traefik-forward-auth
+```
+
+A minimal application example is provided in `k8s-app.yml`.
+
+Example deployment:
+```
+# Deploy traefik-forward-auth
+kubectl apply -f k8s-traefik-forward-auth.yml
+
+# Deploy example whoami app
+kubectl apply -f k8s-app.yml
+```
+
+Please see the advanced examples for more details.