Turn the 1st shell 02-create challenge into MCQ

The first challenge in the shell lesson "02-create.md"
asks the learner to evaluate the result of a serise of
commands. This adds four options so that the challenge
can be used as a MCQ (e.g. to allow peer learning.

The proposed options are:

1 proteins-saved.dat recombine
2 recombine
3 proteins.dat recombine
4 proteins-saved.dat

Option 1 sugests the learner understands that the second argument
to cp is reletive to the first argument (not the current directory).

Option 2 is the correct solution.

Option 3 sugests that the learner has mixed up mv and cp.

Option 4 sugests that, somehow, the current directory has changed to
/home/jamie or /home/jamie/data/recombine