execute class with script/generate

Hi,

There is to do in order to execute a my own class with script/generate?

I have created a class to generate a css files in the directory plugins

#vendor/plugins/css_generator

class CssGenerator < Rails::Generator::Based

def manifest

	record do |m|

  			m.directory "public/stylesheet/top"

		m.file "mytemplates/top.css", "public/stylesheet/top/top.css"

			.....

		..... 

		end

end

end

that I must modify in my application to be able to use my class CssGenerator with script/generate CssGenerator ???

excuse to my bad english and thanks for the help.

a greeting