plugin-skeleton-creator: Creating skeleton for a new plugin is very mechanic and demotivating

This shell script create a plugin skeleton, to help focus on the functionality of the plugin,
instead of lot of energy goes to create the skeleton and make it "make-able".

This script help to create new plugin with creating skeleton
Parameters:
	-n Name of the plugin (required)
	-k The keyword in config file (default: name of the plugin)
	-t Type of the plugin (default: LL_CONTEXT_DESTINATION)
	-d Plugin root dir (default: ${top_srcdir}/modules)
	-h Print this help message

Signed-off-by: Juhász Viktor <viktor.juhasz@balabit.com>