adds README.md for gh-pages which will host the helm repo

README.md

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+## Usage
+
+[Helm](https://helm.sh) must be installed to use the charts.  Please refer to
+Helm's [documentation](https://helm.sh/docs) to get started.
+
+Once Helm has been set up correctly, add the repo as follows:
+
+  helm repo add backup-ns https://allaboutapps.github.io/backup-ns
+
+If you had already added this repo earlier, run `helm repo update` to retrieve
+the latest versions of the packages.  You can then run `helm search repo
+backup-ns` to see the charts.
+
+To install the backup-ns chart:
+
+    helm install my-backup-ns backup-ns/backup-ns
+
+To uninstall the chart:
+
+    helm delete my-backup-ns