Add readme for node-dns-exporter (#127)

node-dns-exporter/README.md

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+# Node-DNS-Exporter
+
+[Node-dns-exporter](https://github.com/evry-ace/node-dns-exporter) is a prometheus exporter for node level DNS metrics. This is intended to run as a DaemonSet in your Kubernetes cluster to report DNS client metrics from each node.
+
+## TL;DR
+
+```console
+  helm repo add evry-ace https://evry-ace.github.io/helm-charts/
+  helm install my-release evry-ace/node-dns-exporter --set nodeDns.testHosts='vg.no\,bt.no'
+```
+
+## Installing the Chart
+
+To install the chart with the release name `my-release`:
+
+```bash
+Add testHosts to the valuefile
+$  helm repo add evry-ace https://evry-ace.github.io/helm-charts/
+$  helm install my-release evry-ace/node-dns-exporter -f path/to/values.yaml
+```
+
+These commands deploy a node-dns-exporter deamonset in the Kubernetes cluster with the default configuration.
+
+> **Tip**: List all releases using `helm list`
+
+## Uninstalling the Chart
+
+To uninstall/delete the `my-release` deployment:
+
+```bash
+$ helm delete my-release
+```
+
+The command removes all the Kubernetes components associated with the chart and deletes the release.
+
+
+### nodeDns parameters (see values for examples)
+
+| Name                            | Description                                                         | Value                           |
+| -------------------------       | -----------------------------------------------------------         | ----------------------------    |
+| `nodeDns.testHosts`             | A string with targets to resolve, splitted by commas                | `""`                            |
+| `nodeDns.requiredSearcdomains`  | A string with searchdomains, splitted by commas                     | `""`                            |
+| `nodeDns.testInterval`          | Frequency to resolve test host                                      | `120`                           |