add AKS with kubelogin + MSI example (#1523)

* Add AKS Kubelogin example code

* Update kubelogin path and add instructions in README

examples/aks-kubelogin/Program.cs

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+using k8s;
+using System;
+using System.IO;
+using System.Text;
+
+var server = "https://example.hcp.eastus.azmk8s.io"; // the server url of your aks
+var clientid = "00000000-0000-0000-0000-000000000000"; // the client id of the your msi
+var kubelogin = @"C:\bin\kubelogin.exe"; // the path to the kubelogin.exe
+
+using var configstream = new MemoryStream(Encoding.ASCII.GetBytes($"""
+apiVersion: v1
+clusters:
+- cluster:
+    insecure-skip-tls-verify: true
+    server: {server}
+  name: aks
+contexts:
+- context:
+    cluster: aks
+    user: msi
+  name: aks
+current-context: aks
+kind: Config
+users:
+- name: msi
+  user:
+    exec:
+      apiVersion: client.authentication.k8s.io/v1beta1
+      args:
+      - get-token
+      - --login
+      - msi
+      - --server-id
+      - 6dae42f8-4368-4678-94ff-3960e28e3630
+      - --client-id
+      - {clientid}
+      command: {kubelogin}
+      env: null
+"""));
+
+var config = KubernetesClientConfiguration.BuildConfigFromConfigFile(configstream);
+IKubernetes client = new Kubernetes(config);
+Console.WriteLine("Starting Request!");
+
+var list = client.CoreV1.ListNamespacedPod("default");
+foreach (var item in list.Items)
+{
+    Console.WriteLine(item.Metadata.Name);
+}

examples/aks-kubelogin/README.md

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+# 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
+```

examples/aks-kubelogin/aks-kubelogin.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+    </PropertyGroup>
+</Project>