Update gitignore

Author: Christopher Fonseka

.gitignore

@@ -3,3 +3,7 @@ Objective-C/Breakout2/Breakout2.xcodeproj/xcuserdata/christopherfonseka.xcuserda
 Objective-C/Breakout2/Breakout2.xcodeproj/xcuserdata/christopherfonseka.xcuserdatad/xcschemes/xcschememanagement.plist
 Objective-C/Breakout2/Breakout2.xcodeproj/project.xcworkspace/xcshareddata/Breakout2.xccheckout
 Objective-C/Breakout2/Breakout2.xcodeproj/xcuserdata/christopherfonseka.xcuserdatad/xcdebugger/Breakpoints_v2.xcbkptlist
+Objective-C/Popper/Popper.xcodeproj/project.xcworkspace/xcshareddata/Popper.xccheckout
+Objective-C/Popper/Popper.xcodeproj/xcuserdata/christopherfonseka.xcuserdatad/xcdebugger/Breakpoints_v2.xcbkptlist
+Objective-C/Popper/Popper.xcodeproj/xcuserdata/christopherfonseka.xcuserdatad/xcschemes/Popper.xcscheme
+Objective-C/Popper/Popper.xcodeproj/xcuserdata/christopherfonseka.xcuserdatad/xcschemes/xcschememanagement.plist