Plugin minecraft-users-ram_: add documentation header

plugins/minecraft/minecraft-users-ram_

@@ -1,7 +1,36 @@
 #!/bin/bash
-# I'm not the author, just wanted to add this plugin to github
-#  Author & instructions: http://wiki.natenom.name/minecraft/munin-plugin
-#  CPU usage update and translation by Leandro Späth (https://github.com/LeoDJ)
+
+: <<=cut
+
+=head1 NAME
+
+minecraft-users-ram_ - monitor ressource usage of a local minecraft server
+
+=head1 APPLICABLE SYSTEMS
+
+Every system with a running minecraft server.
+
+
+=head1 USAGE
+
+Symlink this plugin to /etc/munin/plugins/ by adding the TCP port number used
+by the local mincecraft server. Afterwards restart the munin-node.
+
+Some more instructions: http://wiki.natenom.name/minecraft/munin-plugin
+
+
+=head1 AUTHOR
+
+  2011 Natenom
+  2017 Leandro Späth
+
+
+=head1 MAGIC MARKERS
+
+  #%# family=manual
+  #%# capabilities=
+
+=cut
 
 LC_LANG=C
 MC_PORT=${0##*_}