Requires an Apple Developer account for the App Groups and Network Extension entitlements.
You will need to provision an app group and update bundle IDs throughout the Xcode project as appropriate.
To build, install Go 1.13 or later, and then install gomobile:
go get golang.org/x/mobile/cmd/gomobile
gomobile init
Clone the main Yggdrasil repository and build the Yggdrasil.framework:
git clone https://github.com/yggdrasil-network/yggdrasil-go
cd yggdrasil-go
./build -i
Then copy Yggdrasil.framework into the top-level folder of this repository and then build using Xcode.