Better instructions for running gRPC examples (#1526)

Co-authored-by: Cijo Thomas <cithomas@microsoft.com>

examples/Console/TestGrpcNetClient.cs

@@ -27,6 +27,20 @@ namespace Examples.Console
     {
         internal static object Run()
         {
+            // Prerequisite for running this example.
+            // In a separate console window, start the example
+            // ASP.NET Core gRPC service by running the following command
+            // from the reporoot\examples\GrpcService\.
+            // (eg: C:\repos\opentelemetry-dotnet\examples\GrpcService\)
+            //
+            // dotnet run
+
+            // To run this example, run the following command from
+            // the reporoot\examples\Console\.
+            // (eg: C:\repos\opentelemetry-dotnet\examples\Console\)
+            //
+            // dotnet run grpc
+
             using var openTelemetry = Sdk.CreateTracerProviderBuilder()
                 .AddGrpcClientInstrumentation()
                 .AddSource("grpc-net-client-test")
@@ -51,6 +65,8 @@ namespace Examples.Console
                 }
             }
 
+            System.Console.WriteLine("Press Enter key to exit.");
+
             return null;
         }
     }

examples/GrpcService/Program.cs

@@ -33,6 +33,7 @@ namespace Examples.GrpcService
                 .ConfigureWebHostDefaults(webBuilder =>
                 {
                     webBuilder.UseStartup<Startup>();
+                    webBuilder.UseUrls("https://localhost:44335");
                 });
     }
 }