Add instructions

README.md

@@ -10,7 +10,24 @@ This WebHook solves the DNS01 challenge to prove ownership of DuckDNS domains.
 
 ## Helm Chart
 
-TODO
+[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 csp33 https://csp33.github.io/cert-manager-duckdns-webhook
+
+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
+csp33` to see the charts.
+
+To install the <chart-name> chart:
+
+    helm install cert-manager-duckdns-webhook csp33/cert-manager-duckdns-webhook
+
+To uninstall the chart:
+
+    helm uninstall cert-manager-duckdns-webhook
 
 ### Running the test suite