Add PowerShell cmdlets and update project structure

Examples/PowerShellModuleNew.ps1

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+# Example: PowerShell Module
+# This script demonstrates how to use the PowerShell module
+
+# Import the module
+$modulePath = Join-Path -Path $PSScriptRoot -ChildPath "..\PowerShell\WindowsNotifications.psd1"
+Import-Module $modulePath -Force
+
+# Initialize the notification system
+Initialize-WindowsNotifications
+
+# Check if running as SYSTEM
+$isSystem = Test-SystemContext
+Write-Output "Running as SYSTEM: $isSystem"
+
+# Get interactive user sessions
+$sessions = Get-InteractiveUserSessions
+Write-Output "Interactive user sessions: $($sessions.Count)"
+foreach ($session in $sessions) {
+    Write-Output "  - $session"
+}
+
+# Show a simple notification
+$result = Show-Notification -Title "PowerShell Module" -Message "This notification was shown using the PowerShell module."
+
+# Display the result
+Write-Output "Notification displayed: $($result.Displayed)"
+Write-Output "Notification ID: $($result.NotificationId)"
+
+# If the notification was interacted with, show the details
+if ($result.Activated) {
+    Write-Output "Notification was activated"
+} elseif ($result.Dismissed) {
+    Write-Output "Notification was dismissed"
+}
+
+# Get all notification results
+$results = Get-AllNotificationResults
+Write-Output "Total notification results: $($results.Count)"
+
+# Clear all notification results
+Clear-AllNotificationResults
+Write-Output "All notification results cleared"