Add Blazor test app.

Tests/MQTTnet.Test.BlazorApp/Client/Program.cs

@@ -0,0 +1,21 @@
+using System;
+using System.Net.Http;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Components.WebAssembly.Hosting;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace MQTTnet.Test.BlazorApp.Client
+{
+    public static class Program
+    {
+        public static Task Main(string[] args)
+        {
+            var builder = WebAssemblyHostBuilder.CreateDefault(args);
+            builder.RootComponents.Add<App>("app");
+
+            builder.Services.AddTransient(sp => new HttpClient { BaseAddress = new Uri(builder.HostEnvironment.BaseAddress) });
+
+            return builder.Build().RunAsync();
+        }
+    }
+}