Add comprehensive documentation and examples

docs/examples/Cluster-CreateBackup.ps1

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+# Cluster-CreateBackup.ps1
+# This script demonstrates how to create a cluster backup using the PSProxmox module.
+
+# Import the PSProxmox module
+Import-Module PSProxmox
+
+# Connect to the Proxmox VE server
+$credential = Get-Credential -Message "Enter your Proxmox VE credentials"
+$connection = Connect-ProxmoxServer -Server "proxmox.example.com" -Credential $credential -Realm "pam"
+
+# Method 1: Create a cluster backup with default settings
+$backup = New-ProxmoxClusterBackup -Connection $connection
+
+# Display the backup information
+$backup
+
+# Method 2: Create a cluster backup with compression
+$backup = New-ProxmoxClusterBackup -Connection $connection -Compress
+
+# Display the backup information
+$backup
+
+# Method 3: Create a cluster backup and wait for it to complete
+$backup = New-ProxmoxClusterBackup -Connection $connection -Compress -Wait -Timeout 600
+
+# Display the backup information
+$backup
+
+# Method 4: Get all cluster backups
+$backups = Get-ProxmoxClusterBackup -Connection $connection
+
+# Display the backups
+$backups
+
+# Method 5: Get a specific cluster backup
+$backupID = $backup.BackupID
+$specificBackup = Get-ProxmoxClusterBackup -Connection $connection -BackupID $backupID
+
+# Display the specific backup
+$specificBackup
+
+# Disconnect from the server when done
+Disconnect-ProxmoxServer -Connection $connection