Initial samples: TodoApp and ShellDemo

Two sample applications demonstrating OpenMaui Linux:

TodoApp:
- Full task manager with NavigationPage
- CollectionView with XAML data binding
- DisplayAlert dialogs
- Grid layouts with star sizing

ShellDemo:
- Comprehensive control showcase
- Shell with flyout navigation
- All core MAUI controls demonstrated
- Real-time event logging

Both samples reference OpenMaui.Controls.Linux via NuGet.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

ShellDemo/Pages/AboutPage.cs

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+// AboutPage - Information about OpenMaui Linux
+
+using Microsoft.Maui.Controls;
+using Microsoft.Maui.Graphics;
+
+namespace ShellDemo;
+
+public class AboutPage : ContentPage
+{
+    public AboutPage()
+    {
+        Title = "About";
+
+        Content = new ScrollView
+        {
+            Content = new VerticalStackLayout
+            {
+                Padding = new Thickness(20),
+                Spacing = 20,
+                Children =
+                {
+                    new Label
+                    {
+                        Text = "OpenMaui Linux",
+                        FontSize = 32,
+                        FontAttributes = FontAttributes.Bold,
+                        TextColor = Color.FromArgb("#1A237E"),
+                        HorizontalOptions = LayoutOptions.Center
+                    },
+                    new Label
+                    {
+                        Text = "Version 1.0.0",
+                        FontSize = 16,
+                        TextColor = Colors.Gray,
+                        HorizontalOptions = LayoutOptions.Center
+                    },
+                    new BoxView { HeightRequest = 1, Color = Colors.LightGray },
+                    new Label
+                    {
+                        Text = "OpenMaui Linux brings .NET MAUI to Linux desktops using SkiaSharp for rendering. " +
+                               "It provides a native Linux experience while maintaining compatibility with MAUI's cross-platform API.",
+                        FontSize = 14,
+                        LineBreakMode = LineBreakMode.WordWrap
+                    },
+                    CreateInfoCard("Platform", "Linux (X11/Wayland)"),
+                    CreateInfoCard("Rendering", "SkiaSharp"),
+                    CreateInfoCard("Framework", ".NET MAUI"),
+                    CreateInfoCard("License", "MIT License"),
+                    new BoxView { HeightRequest = 1, Color = Colors.LightGray },
+                    new Label
+                    {
+                        Text = "Features",
+                        FontSize = 20,
+                        FontAttributes = FontAttributes.Bold
+                    },
+                    CreateFeatureItem("Full XAML support with styles and resources"),
+                    CreateFeatureItem("Shell navigation with flyout menus"),
+                    CreateFeatureItem("All standard MAUI controls"),
+                    CreateFeatureItem("Data binding and MVVM"),
+                    CreateFeatureItem("Keyboard and mouse input"),
+                    CreateFeatureItem("High DPI support"),
+                    new BoxView { HeightRequest = 1, Color = Colors.LightGray },
+                    new Label
+                    {
+                        Text = "https://github.com/pablotoledo/OpenMaui-Linux",
+                        FontSize = 12,
+                        TextColor = Colors.Blue,
+                        HorizontalOptions = LayoutOptions.Center
+                    }
+                }
+            }
+        };
+    }
+
+    private Frame CreateInfoCard(string label, string value)
+    {
+        return new Frame
+        {
+            CornerRadius = 8,
+            Padding = new Thickness(15),
+            BackgroundColor = Color.FromArgb("#F5F5F5"),
+            HasShadow = false,
+            Content = new HorizontalStackLayout
+            {
+                Children =
+                {
+                    new Label
+                    {
+                        Text = label + ":",
+                        FontAttributes = FontAttributes.Bold,
+                        WidthRequest = 100
+                    },
+                    new Label
+                    {
+                        Text = value,
+                        TextColor = Colors.Gray
+                    }
+                }
+            }
+        };
+    }
+
+    private View CreateFeatureItem(string text)
+    {
+        return new HorizontalStackLayout
+        {
+            Spacing = 10,
+            Children =
+            {
+                new Label { Text = "✓", TextColor = Color.FromArgb("#4CAF50"), FontSize = 16 },
+                new Label { Text = text, FontSize = 14 }
+            }
+        };
+    }
+}