Add README.md for azure-aks-aso chart

charts/azure-aks-aso/README.md

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+# azure-aks-aso Chart
+
+This Helm chart is used to deploy an Azure Kubernetes Service (AKS) Cluster using the Azure Service Operator (ASO) API.
+
+## Prerequisites
+
+Create a Kubernetes cluster to serve as a Cluster API management cluster. (For example, with `kind`.) Install the Cluster API Provider Azure (CAPZ) components on it with:
+
+```shell
+clusterctl init --infrastructure azure
+```
+
+## Add the cluster-api-charts repository to Helm
+
+```shell
+helm repo add capi https://mboersma.github.io/cluster-api-charts
+```
+
+## Specify values for the CAPZ AKS-ASO chart
+
+Create a `values.yaml` file to specify credentials and other values for the CAPZ AKS-ASO chart. It can look like the following:
+
+```yaml
+credentialSecretName: "aso-credentials"
+createCredentials: true
+subscriptionID: ""
+tenantID: ""
+clientID: ""
+clientSecret: ""
+authMode: ""
+
+# clusterName defaults to the name of the Helm release
+clusterName: ""
+location: eastus
+clusterNetwork: null
+kubernetesVersion: v1.28.9
+subscriptionID: <subscription-id>
+identity:
+  clientID: <client-id>
+  tenantID: <tenant-id>
+  type: WorkloadIdentity
+cluster:
+  location: eastus
+  cidrBlocks:
+  - 192.168.0.0/16
+controlplane:
+  sshPublicKey: <ssh-public-key>
+  networkPolicy: "calico"
+  networkPlugin: "kubenet"
+  networkPluginMode: null
+```
+
+## Install the CAPZ AKS-ASO Helm chart
+
+```bash
+helm install <name> capi/azure-aks-aso -f values.yaml
+```
+
+## Uninstall the CAPZ AKS-ASO Helm chart
+
+```bash
+helm uninstall <name>
+```