new startup process UI for Windows

windows/WinUI/OnboardProcess/EnterToken.xaml.cs

@@ -0,0 +1,57 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Navigation;
+using System.Windows.Shapes;
+
+namespace WinUI.OnboardProcess
+{
+    /// <summary>
+    /// Interaction logic for EnterToken.xaml
+    /// </summary>
+    public partial class EnterToken : UserControl, ISwitchable
+    {
+        public EnterToken()
+        {
+            InitializeComponent();
+
+            if (!string.IsNullOrEmpty(CentralAPI.Instance.Central.APIKey))
+            {
+                APITokenInput.Text = CentralAPI.Instance.Central.APIKey;
+            }
+        }
+
+        public void UtilizeState(object staqte)
+        {
+
+        }
+
+        private void Next_Click(object sender, RoutedEventArgs e)
+        {
+            CentralAPI api = CentralAPI.Instance;
+
+            if (api.Central.APIKey != APITokenInput.Text)
+            {
+                CentralServer server = new CentralServer();
+                server.APIKey = APITokenInput.Text;
+                api.Central = server;
+            }
+
+            Switcher.Switch(new CreateOrJoin());
+        }
+
+        private void BackButton_Click(object sender, RoutedEventArgs e)
+        {
+            Switcher.Switch(new RegisterOrLogIn());
+        }
+    }
+}