iOS implementation

[saschpe]

I am working on an pure-Kotlin ASN.1 encode / decoder that will work as a Kotlin/Multiplatform library. ASN.1 uses BigInteger, which I replaced with your library. However, there is no iOS variant yet so I wonder how I could help out to add one.

[gciatto]

Hi @saschpe.
I am greatly interested in targetting other platforms, but I'm currently lacking the time to practice and gain expertise.

So it would be great if you could:

1. explain to me how to target iOS (maybe here?) and which is the most adequate repository to push iOS-compliant binaries into
2. submit a PR where you edit my build to target iOS
3. both of the above