clean exit on successful install

Install-SyncroAgent.ps1

@@ -1,3 +1,6 @@
+# This script is intended to be called from a Windows Provisioning Package.
+# The provisioning package invokes this script the following way:
+# powershell.exe -ExecutionPolicy Bypass -Command ". $([Scriptblock]::Create((New-Object Net.WebClient).DownloadString('https://dev.emberkom.com/emberkom/management-scripts/raw/branch/master/Install-SyncroAgent.ps1'))) ; Install-SyncroAgent -URL 'https://install.syncromsp.com/agent.msi'"
 
 Function Install-SyncroAgent ([string]$URL) {
 
@@ -24,4 +27,5 @@ Function Install-SyncroAgent ([string]$URL) {
         Write-Error "The Syncro Agent installer was successfully downloaded but could not be found at ""${Installer}"""
         Exit 1
     }
+    Exit 0
 }