complete login function and login window also add attached properties and helper classes for securestring

Server Dashboard/LoginWindow.xaml.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Security;
 using System.Windows;
 using System.Windows.Input;
 
@@ -6,10 +7,13 @@ namespace Server_Dashboard {
     /// <summary>
     /// Interaction logic for LoginWindow.xaml
     /// </summary>
-    public partial class LoginWindow : Window {
+    public partial class LoginWindow : Window, IHavePassword {
         public LoginWindow() {
             InitializeComponent();
             DataContext = new LoginViewModel();
         }
+
+        public SecureString SecurePassword => Password.SecurePassword;
+
     }
 }