feat: Initial commit for DorkNet Admin Mobile app

- Implemented main application structure using .NET MAUI.
- Added App class to manage navigation between Login and Admin pages.
- Created AppDesign class for consistent UI styling.
- Developed pages: LoginPage, DashboardPage, PlayersPage, RoomsPage, SettingsPage, and AdminTabbedPage.
- Integrated AdminApiClient for API interactions and SecureAdminSettings for secure storage of sensitive data.
- Configured Android and iOS platform-specific files including manifest and app delegate.
- Added README with build instructions and authentication details.

DorkNet.AdminMobile/App.cs

@@ -0,0 +1,39 @@
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Maui.Controls;
+using DorkNet.AdminMobile.Design;
+using DorkNet.AdminMobile.Pages;
+
+namespace DorkNet.AdminMobile;
+
+public class App : Application
+{
+    public App(LoginPage loginPage)
+    {
+        UserAppTheme = AppTheme.Dark;
+        MainPage = new NavigationPage(loginPage)
+        {
+            BarBackgroundColor = AppDesign.Canvas,
+            BarTextColor = AppDesign.Text,
+        };
+    }
+
+    public static void ShowAdmin()
+    {
+        Current!.MainPage = new NavigationPage(
+            AppServices.Services.GetRequiredService<AdminTabbedPage>())
+        {
+            BarBackgroundColor = AppDesign.Canvas,
+            BarTextColor = AppDesign.Text,
+        };
+    }
+
+    public static void ShowLogin()
+    {
+        Current!.MainPage = new NavigationPage(
+            AppServices.Services.GetRequiredService<LoginPage>())
+        {
+            BarBackgroundColor = AppDesign.Canvas,
+            BarTextColor = AppDesign.Text,
+        };
+    }
+}