[PATCH] worktree: list operation

I am attempting to add the 'git worktree list' command.  

I don't have a lot of c experience, so please double check that I am not missing something important.

Michael Rappazzo (1):
  worktree:  list operation

 Documentation/git-worktree.txt |  9 ++++-
 builtin/worktree.c             | 80 ++++++++++++++++++++++++++++++++++++++----
 t/t2027-worktree-list.sh       | 68 +++++++++++++++++++++++++++++++++++
 3 files changed, 150 insertions(+), 7 deletions(-)
 create mode 100755 t/t2027-worktree-list.sh