gitignore: add *.DS_Store to .gitignore for OSX
gitignore: add *.DS_Store to .gitignore for OSX

ahb0327/yobi,doortts/fork-yobi,doortts/forked-for-history,Limseunghwan/oss,doortts/forked-for-history,ChangsungKim/TestRepository01,bloodybear/yona,ChangsungKim/TestRepository01,brainagenet/yobi,doortts/fork-yobi,ihoneymon/yobi,yona-projects/yona,ihoneymon/yobi,brainagenet/yobi,oolso/yobi,naver/yobi,violetag/demo,violetag/demo,yona-projects/yona,naver/yobi,ahb0327/yobi,brainagenet/yobi,doortts/fork-yobi,ihoneymon/yobi,bloodybear/yona,doortts/forked-for-history,doortts/fork-yobi,naver/yobi,bloodybear/yona,ahb0327/yobi,oolso/yobi,yona-projects/yona,Limseunghwan/oss,Limseunghwan/oss,bloodybear/yona,yona-projects/yona,oolso/yobi