add comments to template

sources/ext-sysmon/scripts/script-template.desktop

@@ -2,9 +2,17 @@
 Encoding=UTF-8
 Name=aw-script-template
 Comment=Template for external script
+# path to command
 Exec=/path/to/some/command
+# usually you need to leave this field blank
+# use this field to setup script language for example
 X-AW-Prefix=/prefix/to/command/if/required
+# is the script active. true or false
 X-AW-Active=false
+# is the script has output. true or false
 X-AW-Output=false
+# use redirect for the script
+# stderr2stdout, nothing, stdout2stderr
 X-AW-Redirect=nothing
+# update interval in default AW intervals
 X-AW-Interval=1