introductory texts

[RieksJ]

I don't think of myself as a newbie to DIDs (VCs, and SSI stuff), but nevertheless I find it difficult to grasp the ideas behind this (and some other) repo's. It would be helpful if the README could link to, or itself provide texts that help readers understand the gist of what's being done here without assuming them to already know what's there. It's ok to refer to similar texts (in other repo's) if they are prerequisite reading and provided they exist.

Can this be done?

[jceb]

@JelleMillenaar