Updated .gitignore file

.gitignore

@@ -1,4 +1,24 @@
+# Xcode
+build/*
 *.pbxuser
+!default.pbxuser
 *.mode1v3
+!default.mode1v3
 *.mode2v3
+!default.mode2v3
+*.perspectivev3
+!default.perspectivev3
+*.xcworkspace
+!default.xcworkspace
 xcuserdata
+profile
+*.moved-aside
+.DS_Store?
+Icon?
+
+# Thumbnails
+._*
+
+# Files that might appear on external disk
+.Spotlight-V100
+.Trashes