Add privacy manifest file

[mii-chan]

Why?

Apps and third-party SDKs should contain a privacy manifest file by Spring 2024 to avoid the app review rejection.

How?

Since swift-user-defaults uses UserDefaults,

• NSPrivacyAccessedAPITypes
  • NSPrivacyAccessedAPIType: NSPrivacyAccessedAPICategoryUserDefaults
  • NSPrivacyAccessedAPITypeReasons: C56D.1?

What I'd like you to review/discuss

https://developer.apple.com/documentation/bundleresources/privacy_manifest_files/describing_use_of_required_reason_api#4278401

C56D.1
Declare this reason if your third-party SDK is providing a wrapper function around user defaults API(s) for the app to use, and you only access the user defaults APIs when the app calls your wrapper function. This reason may only be declared by third-party SDKs. This reason may not be declared if your third-party SDK was created primarily to wrap required reason API(s).

Information accessed for this reason, or any derived information, may not be used for your third-party SDK’s own purposes or sent off-device by your third-party SDK.

I thought C56D.1 was appropriate as this library provided wrapper functions around UserDefaults API and added some Swift friendly functionalities.

This reason may not be declared if your third-party SDK was created primarily to wrap required reason API(s).

But according to this statement, we can't use it since it's exclusively a UserDefaults API wrapper? 😕
However, if C56D.1 cannot be used, which one would be appropriate for this library? (I don't think any of the options are suitable for our use...)

[mii-chan]

still not sure which reason is appropriate for this library...😭