Add SO to gitignore
Add SO to gitignore

melonmanchan/left-pad-services,melonmanchan/left-pad-services,melonmanchan/left-pad-services,melonmanchan/left-pad-services,melonmanchan/left-pad-services,melonmanchan/left-pad-services,melonmanchan/left-pad-services,melonmanchan/left-pad-services