Merge branch 'master' of https://github.com/SyncfusionExamples/maui-pdf-viewer-examples into PDFAutoSave

Author: Nandhakumar-SF4686

DocumentViewerDemo/App.xaml

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+<?xml version = "1.0" encoding = "UTF-8" ?>
+<Application xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             xmlns:local="clr-namespace:DocumentViewerDemo"
+             x:Class="DocumentViewerDemo.App">
+    <Application.Resources>
+        <ResourceDictionary>
+            <ResourceDictionary.MergedDictionaries>
+                <ResourceDictionary Source="Resources/Styles/Colors.xaml" />
+                <ResourceDictionary Source="Resources/Styles/Styles.xaml" />
+            </ResourceDictionary.MergedDictionaries>
+        </ResourceDictionary>
+    </Application.Resources>
+</Application>

DocumentViewerDemo/App.xaml.cs

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+namespace DocumentViewerDemo
+{
+    public partial class App : Application
+    {
+        public App()
+        {
+            Syncfusion.Licensing.SyncfusionLicenseProvider.RegisterLicense("Add valid license key");
+            InitializeComponent();
+        }
+
+        protected override Window CreateWindow(IActivationState? activationState)
+        {
+            return new Window(new AppShell());
+        }
+    }
+}

DocumentViewerDemo/AppShell.xaml

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+<?xml version="1.0" encoding="UTF-8" ?>
+<Shell
+    x:Class="DocumentViewerDemo.AppShell"
+    xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+    xmlns:local="clr-namespace:DocumentViewerDemo"
+    Title="DocumentViewerDemo">
+
+    <ShellContent
+        Title="Home"
+        ContentTemplate="{DataTemplate local:MainPage}"
+        Route="MainPage" />
+
+</Shell>

DocumentViewerDemo/AppShell.xaml.cs

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+namespace DocumentViewerDemo
+{
+    public partial class AppShell : Shell
+    {
+        public AppShell()
+        {
+            InitializeComponent();
+        }
+    }
+}