document usage and location of configuration (#32)

README.md

@@ -0,0 +1,23 @@
+## Chart - Usage
+
+### Prerequisites
+- [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 <alias> https://puzzle.github.io/cert-manager-webhook-dnsimple
+    ```
+    If you had already added this repo earlier, run `helm repo update` to retrieve the latest versions of the packages.
+
+
+### Installing
+To install the cert-manager-webhook-dnsimple chart:
+```
+helm install <my-chart-name> <alias>/cert-manager-webhook-dnsimple
+```
+To uninstall the chart:
+```
+helm delete <my-chart-name>
+```
+
+### Configuration
+The required configuration values are listed in the repository's README under [puzzle/cert-manager-webhook-dnsimple](https://github.com/puzzle/cert-manager-webhook-dnsimple#options).