Using a string as a class variable

My script relies on a single argument in the form $stdin user input:

class Project
  def initialize()
    puts "What do you want to call this project?\n"
    print "> "

    $user_input = $stdin.gets.chomp

The script is organised into a single class that contains consecutive methods.

The simplest way I have found to utilise the user input is to declare it in each method.

  def define_folders()
    project_name = $user_input

  def create_gemfile()
    project_name = $user_input

However, this is repetitive.

What would be a better way?