Add register page, associated view model and successfully call service that just sends back received data

Services/AuthService/AuthService.cs

@@ -0,0 +1,16 @@
+using Sandbox.Models.ViewModels;
+
+namespace Sandbox.Services.AuthService;
+
+public class AuthService : IAuthService
+{
+    public async Task<ServiceResponse<int>> Register(string userName, string password)
+    {
+        return new ServiceResponse<int>
+        {
+            Data = 1,
+            Message = $"Got register request with user name {userName}",
+            Success = true
+        };
+    }
+}

Services/AuthService/IAuthService.cs

@@ -0,0 +1,8 @@
+using Sandbox.Models.ViewModels;
+
+namespace Sandbox.Services.AuthService;
+
+public interface IAuthService
+{
+    Task<ServiceResponse<int>> Register(string userName, string password);
+}