Kustomize installer: add Kubernetes overlay

kustomize/README.md

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+# Flagger Kustomize installer
+
+## Service mesh specific installers
+
+Install Flagger for Istio:
+
+```bash
+kubectl apply -k github.com/weaveworks/flagger/kustomize/istio
+```
+
+This deploys Flagger in the `istio-system` namespace and sets the metrics server URL to `http://prometheus.istio-system:9090`.
+
+Install Flagger for Linkerd:
+
+```bash
+kubectl apply -k github.com/weaveworks/flagger/kustomize/linkerd
+```
+
+This deploys Flagger in the `linkerd` namespace and sets the metrics server URL to `http://linkerd-prometheus.linkerd:9090`.
+
+## Generic installer
+
+Install Flagger and Prometheus:
+
+```bash
+kubectl apply -k github.com/weaveworks/flagger/kustomize/kubernetes
+```
+
+This deploys Flagger and Prometheus in the `flagger-system` namespace,
+sets the metrics server URL to `http://flagger-prometheus.flagger-system:9090` and the mesh provider to `kubernetes`.
+
+To target a specific provider you need to specify it in the canary custom resource:
+
+```yaml
+apiVersion: flagger.app/v1alpha3
+kind: Canary
+metadata:
+  name: app
+  namespace: test
+spec:
+  # can be: kubernetes, istio, appmesh, linkerd, smi, nginx, gloo, supergloo
+  # use the kubernetes provider for Blue/Green style deployments
+  provider: nginx
+```
+
+## Customized installer
+
+Create a kustomization file using flagger as base:
+
+```bash
+cat > kustomization.yaml <<EOF
+namespace: istio-system
+bases:
+  - github.com/weaveworks/flagger/kustomize/base/flagger
+patchesStrategicMerge:
+  - patch.yaml
+EOF
+```
+
+Create a patch and enable Slack notifications by setting the slack channel and hook URL:
+
+```bash
+cat > patch.yaml <<EOF
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: flagger
+spec:
+  template:
+    spec:
+      containers:
+        - name: flagger
+          args:
+            - -mesh-provider=istio
+            - -metrics-server=http://prometheus.istio-system:9090
+            - -slack-user=flagger
+            - -slack-channel=alerts
+            - -slack-url=https://hooks.slack.com/services/YOUR/SLACK/WEBHOOK
+EOF
+```
+
+Install Flagger with Slack:
+
+```bash
+kubectl apply -k .
+```
+

kustomize/kubernetes/kustomization.yaml

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+namespace: flagger-system
+resources:
+  - namespace.yaml
+bases:
+  - ../base/flagger/
+  - ../base/prometheus/
+patchesStrategicMerge:
+  - patch.yaml

kustomize/kubernetes/namespace.yaml

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+apiVersion: v1
+kind: Namespace
+metadata:
+  name: flagger-system
+  annotations:
+    linkerd.io/inject: disabled
+  labels:
+    istio-injection: disabled
+    appmesh.k8s.aws/sidecarInjectorWebhook: disabled

kustomize/kubernetes/patch.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: flagger
+spec:
+  template:
+    spec:
+      containers:
+        - name: flagger
+          args:
+            - -mesh-provider=kubernetes
+            - -metrics-server=http://flagger-prometheus:9090
+            - -slack-user=flagger
+            - -slack-channel=
+            - -slack-url=