add AKS with kubelogin + MSI example (#1523)

* Add AKS Kubelogin example code

* Update kubelogin path and add instructions in README

examples/aks-kubelogin/README.md

@@ -0,0 +1,24 @@
+# AKS C# example using kubelogin + MSI
+
+This example shows how to use the [kubelogin](https://github.com/Azure/kubelogin) to authenticate using [managed identities](https://learn.microsoft.com/en-us/entra/identity/managed-identities-azure-resources/overview) with Azure Kubernetes Service (AKS) using the C# SDK.
+
+
+## Prerequisites
+
+ - turn on AAD support for AKS, see [here](https://docs.microsoft.com/en-us/azure/aks/managed-aad)
+ - create a managed identity for the AKS cluster
+ - assign the managed identity the `Azure Kubernetes Service RBAC Cluster Admin` (or other RBAC permission) on the AKS cluster
+ - assign the managed identity to the VM, see [here](https://docs.microsoft.com/en-us/azure/active-directory/managed-identities-azure-resources/qs-configure-portal-windows-vm)
+ - install the [kubelogin](https://github.com/Azure/kubelogin) to your machine
+
+## Running the code
+
+ *You must the the code on VM with MSI*
+
+ - Replace `server` with the address of your AKS cluster
+ - Replace `clientid` with the client id of the managed identity
+ - Replace `kubelogin` with the path to the kubelogin executable
+
+```
+dotnet run
+```