adding bogus library so i can play around with git-subtree
Add 'libfoo-subtree/' from commit '931322cddcdb363b543cff9bb60d88f1e2a461ec'

git-subtree-dir: libfoo-subtree
git-subtree-mainline: e56bbac27182dc7886ee890f0aaa9d49593ffd23
git-subtree-split: 931322cddcdb363b543cff9bb60d88f1e2a461ec
added a comment