Need to add a Privacy Manifest for use of NSUserDefaults

[David-Nest]

Apple is going to start requiring Privacy Manifests sometime in “Spring 2024” for apps and 3rd Party SDKs. Failure to comply with their mandate may lead to issues with releasing new versions of your app on the Apple App Store. Here is the WWDC 2023 video describing Privacy Manifests if you would like more context on Privacy Manifests.

Our app uses NHNetworkTime library and we have found a usage of NSUserDefaults that falls under the required Reasons API category in Privacy Manifests.

https://github.com/huynguyencong/NHNetworkTime/blob/master/NHNetworkTime/NHNetworkClock.m#L94

As we want to continue using this SDK, we would like to request an .xcprivacy added to the library annotating the usage of NSUserDefaults. This will help unblocks apps that use this SDK and comply with the Privacy Manifest requirements from Apple.