def add_param(name, text, scope=nil)
      scope or scope = 'Parameters'
      @params[scope] ||= {}
      @params[scope][name] = text
    end
def add_param(name, text, scope=nil)
      scope or scope = 'Parameters'
      @params[scope] ||= {}
      @params[scope][name] = text
    end
Add a patameter and its help text.