Add license headers

Author: g7ed6e

Scenarios/Authentication/Minimal-machine-to-machine-using-JWT/Client/Program.cs

@@ -1,4 +1,7 @@
-using System.Net;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.Net;
 using System.ServiceModel;
 using System.ServiceModel.Channels;
 using IdentityModel.Client;

Scenarios/Authentication/Minimal-machine-to-machine-using-JWT/Service/ISecuredService.cs

@@ -1,4 +1,7 @@
-namespace Service;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+namespace Service;
 
 [ServiceContract]
 public interface ISecuredService

Scenarios/Authentication/Minimal-machine-to-machine-using-JWT/Service/Program.cs

@@ -1,4 +1,7 @@
-using Microsoft.AspNetCore.Authentication.JwtBearer;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using Microsoft.AspNetCore.Authentication.JwtBearer;
 using Microsoft.AspNetCore.Authorization;
 
 var builder = WebApplication.CreateBuilder();

Scenarios/Authentication/Minimal-machine-to-machine-using-JWT/Service/SecuredService.cs

@@ -1,4 +1,7 @@
-using Microsoft.AspNetCore.Authorization;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
 
 namespace Service