Added link to more information about the available options

Objective-C.gitignore

@@ -47,6 +47,8 @@ Carthage/Build
 #
 # It is recommended to not store the screenshots in the git repo. Instead, use fastlane to re-generate the 
 # screenshots whenever they are needed.
+# For more information about the recommended setup visit:
+# https://github.com/fastlane/fastlane/blob/master/docs/Gitignore.md
 
 fastlane/report.xml
 fastlane/screenshots