Encryption Envelope JS

Javascript (written in typescript) version of the encryption envelope for both anoncrypt & authcrypted messages. This library is built for any javascript environment that needs to use the encrypted format. It is built on libsodium-js and has been tested and verified secure against the indy-sdk Rust implimentation linked to in the supporting document found here: https://github.com/hyperledger/aries-rfcs/blob/master/features/0019-encryption-envelope/README.md

This pack is currently available on NPM here: https://www.npmjs.com/package/pack-unpack under the name pack-unpack.

Plans are currently under the way to move this repo into DIF.