Show licenses in About view

Closes #4

src/Views/AboutView.axaml

@@ -22,6 +22,18 @@
         <TextBlock Text="App icon made using https://gauger.me/fonticon/ with FontAwesome icon 'file-invoice-dollar' and the macOS software Icon Composer."
                    TextWrapping="Wrap"
                    FontSize="14"/>
+        <Label Content="Open Source Licenses:"/>
+        <ScrollViewer Margin="2"
+                      Grid.Row="4"
+                      x:Name="LogScrollView"
+                      VerticalScrollBarVisibility="Visible"
+                      AllowAutoHide="False"
+                      MaxHeight="250">
+            <SelectableTextBlock Margin="2"
+                                 TextWrapping="Wrap"
+                                 FontSize="10"
+                                 x:Name="LicenseTextBlock"/>
+        </ScrollViewer>
         <TextBlock Text="Copyright 2026 - Quickity Quack Productions"
                    TextWrapping="Wrap"
                    HorizontalAlignment="Center"

src/Views/AboutView.axaml.cs

@@ -1,4 +1,5 @@
 using System;
+using System.IO;
 using Avalonia;
 using Avalonia.Controls;
 using Avalonia.Markup.Xaml;
@@ -10,6 +11,27 @@ namespace MayShow.Views
         public AboutView()
         {
             this.InitializeComponent();
+
+            // set license text
+            var licenseFileName = "Assets/LICENSES.txt";
+            var licenseText = "";
+            if (File.Exists(licenseFileName))
+            {
+                licenseText = File.ReadAllText(licenseFileName);
+            }
+            else
+            {
+                licenseFileName = "../Resources/Assets/LICENSES.txt";
+                if (File.Exists(licenseFileName))
+                {
+                    licenseText = File.ReadAllText(licenseFileName);
+                }
+                else
+                {
+                    licenseText = "Error: Unable to find license file!";
+                }
+            }
+            LicenseTextBlock.Text = licenseText;
         }
     }
 }