Add privacy manifest

[onevcat]

Currently, APNGKit is not tracking any user information, nor using any APIs that being required to be declare. So we just have an empty privacy manifest file for now in case that Apple is trying to detect it.

Fixes #143

[onevcat]

@CodiumAI-Agent /review

[CodiumAI-Agent]

PR Review

⏱️ Estimated effort to review [1-5]	2, because the PR introduces a new privacy manifest file and updates the Swift package and podspec to include this new file. The changes are straightforward and limited to configuration and manifest files, which makes the review process less complex. However, ensuring the correctness of the manifest content and its integration requires some knowledge about Apple's privacy requirements and Swift package management.
🧪 Relevant tests	No
🔍 Possible issues	Possible Issue: The PrivacyInfo.xcprivacy file is empty, which might not be sufficient if future updates of the app include features that require privacy declarations. It's important to keep this file updated according to Apple's guidelines.
🔒 Security concerns	No

Code feedback:

---

relevant file	Package@swift-5.9.swift
suggestion	Consider specifying the Swift language versions supported by the package in the swiftLanguageVersions attribute to ensure compatibility. This can help developers and CI tools to build the package with the correct Swift version. [medium]
relevant line	platforms: [.macOS(.v10_13), .iOS(.v12), .tvOS(.v12)],

---

relevant file	APNGKit.podspec
suggestion	It's recommended to specify the iOS, macOS, and tvOS deployment targets in the podspec to ensure the library does not get integrated into projects that do not support these minimum platform versions. [medium]
relevant line	s.resource_bundles = {"APNGKit" => ["Source/APNGKit/PrivacyInfo.xcprivacy"]}

---

relevant file	Source/APNGKit/PrivacyInfo.xcprivacy
suggestion	Ensure that the PrivacyInfo.xcprivacy file is updated as soon as any feature requiring privacy permissions is added. It's crucial for complying with Apple's App Store Review Guidelines. [important]
relevant line

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