Update gitignore

Author: kwan3854

.gitignore

@@ -69,4 +69,7 @@ crashlytics-build.properties
 
 # Temporary auto-generated Android Assets
 /[Aa]ssets/[Ss]treamingAssets/aa.meta
-/[Aa]ssets/[Ss]treamingAssets/aa/*
+/[Aa]ssets/[Ss]treamingAssets/aa/*
+
+# macOS Finder file that stores custom view settings
+.DS_Store