feat(domain): add DID standard model

[goncalo-frade-iohk]

No description provided.

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ REPOSITORY	checkov	yes		no	6.81s
✅ REPOSITORY	devskim	yes		no	0.69s
✅ REPOSITORY	dustilock	yes		no	0.0s
✅ REPOSITORY	gitleaks	yes		no	0.15s
✅ REPOSITORY	git_diff	yes		no	0.0s
✅ REPOSITORY	secretlint	yes		no	2.0s
✅ REPOSITORY	syft	yes		no	0.84s
✅ REPOSITORY	trivy	yes		no	2.21s

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[hamada147]

LGTM

[patlo-iog]

Did you mean scheme? The rest LGTM

[goncalo-frade-iohk]

Well least from a English perspective it is a Schema. But in W3 documents is written Scheme xD

As nouns the difference between scheme and schema is that scheme is a systematic plan of future action while schema is an outline or image universally applicable to a general conception, under which it is likely to be presented to the mind.