Finished backup service draft

Program.cs

@@ -0,0 +1,13 @@
+using OneDriveBackupService;
+
+var builder = Host.CreateApplicationBuilder(args);
+
+builder.Configuration.AddEnvironmentVariables();
+
+builder.Services.AddSingleton(new ConfigData(builder.Configuration));
+builder.Services.AddTransient<OneDriveClient>();
+
+builder.Services.AddHostedService<Worker>();
+
+var host = builder.Build();
+host.Run();