Added usage and example for documentation

deploy_checkit_tiff/add_dnx_mappings/add_dnx_mappings.pl

@@ -2,6 +2,9 @@
 # adds all dnx properties
 # by Andreas Romeyke (andreas.romeyke@slub-dresden.de) and Serhiy Bolkun (serhiy.bolkun@slub-dresden.de)
 #
+# usage:   perl add_dnx_mappings.pl host user password institution port
+# example: perl add_dnx_mappings.pl sdvdev.slub-dresden.de mustermann 12345 slub 8080
+#
 # needs a geckodriver and the Selenium::Remote::Driver module
 # see http://www.seleniumhq.org/
 #