docs: Add AnonCred method specification

[EzequielPostan]

This PR adds a draft for the AnonCred method specification based on the PRISM DID method

Note: this is a draft for review only. The actual spec will be published in a different repository to be defined. I added it here for internal review first.

Nicer read at: https://github.com/input-output-hk/atala-prism/blob/ATL-7317-anon-cred-method-spec/AnonCred-method-spec.md

Overview

Screenshots

Checklists

Pre-submit checklist:

• Self-reviewed the diff
• New code has proper comments/documentation/tests
• Any changes not covered by tests have been tested manually
• The README files are updated
• If new libraries are included, they have licenses compatible with our project
• If there is a db migration altering existing tables, there is a proper migration test

Pre-merge checklist:

• Commits have useful messages
• Review clarifications made it into the code

[Dale-iohk]

Checkmarx One – Scan Summary & Details – a39858fe-8204-4408-b31d-5b906457299a

Fixed Issues

Severity	Issue	Source File / Package
	Unpinned Actions Full Length Commit SHA	/unit-tests.yml: 41
	Unpinned Actions Full Length Commit SHA	/release.yml: 38
	Unpinned Actions Full Length Commit SHA	/release.yml: 55
	Unpinned Actions Full Length Commit SHA	/scala-steward.yml: 30
	Unpinned Actions Full Length Commit SHA	/unit-tests.yml: 25
	Unpinned Actions Full Length Commit SHA	/release.yml: 44
	Unpinned Actions Full Length Commit SHA	/release.yml: 34
	Unpinned Actions Full Length Commit SHA	/release.yml: 48
	Unpinned Actions Full Length Commit SHA	/pr-lint.yml: 18
	Unpinned Actions Full Length Commit SHA	/release.yml: 63
	Unpinned Actions Full Length Commit SHA	/scala-steward.yml: 22
	Unpinned Actions Full Length Commit SHA	/lint.yml: 28
	Unpinned Actions Full Length Commit SHA	/release.yml: 61

[atala-dev]

🦙 MegaLinter status: ⚠️ WARNING

Descriptor	Linter	Files	Fixed	Errors
⚠️ MARKDOWN	markdownlint	1		23
✅ MARKDOWN	markdown-link-check	1		0
✅ MARKDOWN	markdown-table-formatter	1		0
✅ REPOSITORY	dustilock	yes		no
✅ REPOSITORY	git_diff	yes		no
⚠️ REPOSITORY	kics	yes		1
✅ REPOSITORY	syft	yes		no

See detailed report in MegaLinter reports
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[github-actions]

Unit Test Results

288 tests  ±0   288 ✔️ ±0   22s ⏱️ ±0s
  36 suites ±0       0 💤 ±0 
  36 files   ±0       0 ❌ ±0 

Results for commit 00fe7d5. ± Comparison against base commit 0bb23aa.

[EzequielPostan]

moved to the PRISM DID Method repository