docs: add attestation service documentation and diagram

[SaeeDawod]

Summary by Sourcery

Documentation:

• Add comprehensive documentation for the Ethereum Attestation Service (EAS), including an introduction, key concepts, workflow, contract deployment, schema registration, attestation creation, verification methods, and integration studio implementation.

[sourcery-ai]

Reviewer's Guide by Sourcery

This PR adds comprehensive documentation for the Ethereum Attestation Service (EAS), including detailed guides for setup, implementation, and usage. The documentation is implemented as a Markdown file with embedded code examples, diagrams, and interactive tabs.

Class diagram for Ethereum Attestation Service (EAS) components

classDiagram
    class SchemaRegistry {
        +register(string schema, address resolver, bool revocable) returns (bytes32)
        +event Registered(bytes32 uid, address owner, string schema, address resolver, bool revocable)
    }
    class EAS {
        +attest(schema, data)
        +getAttestation(bytes32 attestationUID)
    }
    class CustomResolver {
        +validate(bytes32 attestationUID, address attester, bytes data) returns (bool)
        +mapping(address => bool) trustedAttesters
    }
    SchemaRegistry --> EAS : uses
    EAS --> CustomResolver : optional validation
    note for SchemaRegistry "Manages schemas for attestations"
    note for EAS "Handles creation and management of attestations"
    note for CustomResolver "Provides additional validation logic"

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File-Level Changes

Change	Details	Files
Added comprehensive EAS documentation with key concepts and implementation details	Added introduction section explaining EAS and its benefits Included core components explanation (SchemaRegistry, EAS Contract, Attestations, Resolvers) Added workflow diagram and explanation Provided contract deployment instructions with both Task Menu and Terminal options	docs/developer-guides/attestation-service.md
Added code examples and implementation guides for EAS functionality	Added schema registration example with detailed code Included attestation creation implementation with examples Added verification methods with both EAS SDK and Custom Resolver options Provided attestation indexer setup and query examples	docs/developer-guides/attestation-service.md
Added Integration Studio implementation guide with Node-RED flow	Added complete flow implementation for EAS interactions Included flow JSON configuration Added setup and configuration instructions Provided debug and monitoring guidance	docs/developer-guides/attestation-service.md

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[sourcery-ai]

Hey @SaeeDawod - I've reviewed your changes - here's some feedback:

Overall Comments:

• Consider adding a security best practices section that covers proper handling of private keys and API endpoints. The current examples show these values directly in code which could encourage unsafe practices.
• The error handling examples could be expanded to show more comprehensive error cases and recovery strategies, particularly in the verification section.

Here's what I looked at during the review

• 🟡 General issues: 1 issue found
• 🟢 Security: all looks good
• 🟢 Review instructions: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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