We're going to build a simple program that implements only the very first thing a complete Tic Tac Toe program would require, which is to greet the player with a welcome message.

1. Read the output from running learn.
2. Use puts to print "Welcome to Tic Tac Toe!"
3. Have tests pass locally by running learn.
4. Submit solution.

1. Run learn
2. Read output.
3. Code solution in lib/welcome.rb
4. Run learn
5. Read output.
6. If still broken, repeat 3-5
7. If passing, submit with learn submit