Add compliance with W3C's VC standard

[0xturboblitz]

The most accepted standard for verifiable credentials is the Verifiable Credentials Data Model v2.0 established by the World Wide Web Consortium.

Proof of Passport should be able to comply with that standard.

The way it could work is by formatting the current attestation data according to the standard, then either:

• Create a Proof of Passport App letting users export their proof as a VC
• Add the VC format by default for new apps that need to verify proofs offchain with the sdk

[CristopherAguilar10]

Hello @0xturboblitz , I would like to create my first issue and this one seems quite interesting. Can I help with it?

[onlydustapp]

Hey @CristopherAguilar10!
Thanks for showing interest.
We've created an application for you to contribute to Proof of Passport.
Go check it out on OnlyDust!

[0xturboblitz]

Hi, yes and feel free to dm for any questions

[CristopherAguilar10]

@0xturboblitz Ok, thank you very much. We will be in touch

[0xturboblitz]

Some preliminary work on #160.

Closing because not a priority right now, as we're not sure which standard will be needed, and have not received requests to use a specific one for not.