update chart with newer version of dashboard and dashboard-backend

deployment/helmchart/README.md

@@ -0,0 +1,29 @@
+# What is this?
+
+Installs the Stackspin Dashboard into a Kubernetes cluster.
+
+## Installation
+
+**NOTE:** Some values need to be overwritten during installation. See `values-local.yaml.example` for an example of
+configurations you might want to do. These instructions assume you copy
+`values-local.yaml.example` to `values-local.yaml` and edit it.
+
+It is very important that you overwrite the following password and
+secrets variables manually when you run helm install:
+
+- `backend.secretKey`
+- `backend.kratosUrl`
+
+Add our helm repository[^1]:
+
+```
+helm repo add stackspin-dashboard https://open.greenhost.net/api/v4/projects/48/packages/helm/stable
+```
+
+Then install the chart:
+
+```
+helm install -f values-local.yaml my-dashboard stackspin-dashboard/dashboard
+```
+
+[^1]: If you want to test a version that is not on the `main` branch yet, use `https://open.greenhost.net/api/v4/projects/1/packages/helm/unstable`