added ApiClient

DDApp/DDApplication/Program.cs

@@ -1,16 +1,26 @@
 using Avalonia;
 using System;
+using Microsoft.Extensions.Configuration;
 
 namespace DDApplication;
 
-internal static class Program
+internal class Program
 {
+    public static IConfiguration Configuration { get; private set; } = null!;
     // Initialization code. Don't use any Avalonia, third-party APIs or any
     // SynchronizationContext-reliant code before AppMain is called: things aren't initialized
     // yet and stuff might break.
     [STAThread]
-    public static void Main(string[] args) => BuildAvaloniaApp()
-        .StartWithClassicDesktopLifetime(args);
+    public static int Main(string[] args)
+    {
+        Configuration = new ConfigurationBuilder()
+            .AddJsonFile("appsettings.json", optional: true)
+            .AddUserSecrets<Program>(optional: true)
+            .AddEnvironmentVariables()
+            .Build();
+        return BuildAvaloniaApp()
+            .StartWithClassicDesktopLifetime(args);
+    }
 
     // Avalonia configuration, don't remove; also used by visual designer.
     private static AppBuilder BuildAvaloniaApp()