added library project
Split 'library/' into commit 'c7b416b0354bbb86141791542068927cb218487e'

git-subtree-dir: library
git-subtree-mainline: 3d3e7afb62b66cb3b20b7c4768f9f652da9ca486
git-subtree-split: c7b416b0354bbb86141791542068927cb218487e