Add aks example

[drew0ps]

Tested in my AKS sub:

k get azurekubernetescluster                                                                                                                                                                                                                                                                                           
NAME             SYNCED   READY   COMPOSITION   AGE
my-aks-cluster   True     True    aks-cluster   6m33s

k get resourcegroups.azure.upbound.io                                                                                                                                                                                                                                                                                  
NAME                SYNCED   READY   EXTERNAL-NAME       AGE
my-resource-group   True     True    my-resource-group   6m39s

 k get kubernetescluster                                                                                                                                                                                                                                                                                                
NAME             SYNCED   READY   EXTERNAL-NAME    AGE
my-aks-cluster   True     True    my-aks-cluster   6m44s