Update .gitignore

.gitignore

@@ -6,3 +6,18 @@ build/
 nohup.out
 .DS_Store
 xcuserdata/
+*.pbxuser
+!default.pbxuser
+*.mode1v3
+!default.mode1v3
+*.mode2v3
+!default.mode2v3
+*.perspectivev3
+!default.perspectivev3
+*.xcworkspace
+!default.xcworkspace
+*xcuserdata
+profile
+*.moved-aside
+DerivedData
+extern/