Add uPort integration

[Mischi]

Currently, the Asure dApp only supports a fixed set of hardcoded Asure accounts. An Asure account includes personal data (full name, birthdate, profile image, etc.) about the person owning the account. Once we allow the creation of Asure accounts, we have to store the data somewhere.

uPort provides an open protocol and tools of a decentralized identity system which we wanna leverage for that purpose.