Removing prometheus-net dependency (#1526)

* Update README.md

* Update KubernetesClient.csproj

* Delete examples/prometheus directory

* Delete src/KubernetesClient/PrometheusHandler.cs

examples/prometheus/Prometheus.cs

@@ -1,29 +0,0 @@
-using k8s;
-using Prometheus;
-using System;
-using System.Threading;
-
-namespace prom
-{
-    internal class Prometheus
-    {
-        private static void Main(string[] args)
-        {
-            var config = KubernetesClientConfiguration.BuildDefaultConfig();
-            var handler = new PrometheusHandler();
-            IKubernetes client = new Kubernetes(config, handler);
-
-            var server = new MetricServer(hostname: "localhost", port: 1234);
-            server.Start();
-
-            Console.WriteLine("Making requests!");
-            while (true)
-            {
-                client.CoreV1.ListNamespacedPod("default");
-                client.CoreV1.ListNode();
-                client.AppsV1.ListNamespacedDeployment("default");
-                Thread.Sleep(1000);
-            }
-        }
-    }
-}

examples/prometheus/prometheus.csproj

@@ -1,7 +0,0 @@
-<Project Sdk="Microsoft.NET.Sdk">
-
-  <PropertyGroup>
-    <OutputType>Exe</OutputType>
-  </PropertyGroup>
-
-</Project>