Add update_agent.cmd

install-beszel-service.cmd

@@ -1,5 +1,19 @@
 @echo off
 cd /D "%~dp0"
+echo This script installs the Beszel agent for Windows.
+echo If not yet installed, NSSM will be installed via Winget.
+echo.
+
+echo Checking adminstrative rights
+rem from https://stackoverflow.com/questions/7985755/how-to-detect-if-cmd-is-running-as-administrator-has-elevated-privileges
+net session >nul 2>&1
+if %errorlevel% equ 0 (
+	echo Administrative rights check OK
+) else (
+	echo You are NOT Administrator. Start the script from an administrative cmd.exe shell...
+	goto end
+)
+
 if !%1==! goto help
 if !%2==! goto help