PopH264 Swift Package

This repository is a release/build repositor for use with xcode & Swift Package Manager for PopH264

This is currently manually maintained.

Discovered that the binary target can be a zipped url, which can come from github releases.

Need to generate checksum; https://developer.apple.com/forums/thread/655951
- swift package compute-checksum some.xcframework.zip
todo: auto generate [future] url & checksum in PopH264's github action and then can have Package.swift in the Poph264 repository?