Introduction: who is the Intended Audience?

[mwherman2000]

Similar to w3c/did-resolution#19, I recommend the addition of the following verbiage to the Introduction section of the DID-CORE specification:
Cc: @peacekeeper

Intended Audience

This specification's primary audience is implementors of systems and services that use decentralized systems technologies (e.g. decentralized identifiers and verifiable credentials). The intended audience includes, but is not limited to, software architects, data modelers, application developers, services developers, testers, operators, and user experience (UX) specialists. In addition, other people involved in a broad range of standards efforts related to decentralized identity, verifiable credentials, and secure storage may also be interested in reading this specification.