Revert "add .idea and .DS_Store into gitignore"
Revert "add .idea and .DS_Store into gitignore"

This reverts commit f80daac6958bb03d085ff92501ea9a0ca58afeb1.

jack0331/peddler,yasuhisa1984/peddler,agerwick/peddler,yuhei-mukoyama/peddler,parallel588/peddler,VandyParks/peddler