Creation of input_tools.rb module, removal of prompt method from name_age.rb
Creation of start_up.rb, moving of user_input method to input_tools.rb
Fix of name_age.rb
Fix of name_age.rb and start_up.rb
Playing with include/require in name_age.rb and start_up.rb
Sorting out of require and include in name_age.rb and start_up.rb
Modification of name_age.rb and start_up.rb, and addition of character.rb class sheet