docs: Add comprehensive CONTRIBUTING.md for AI agent trust layer

[Kubudak90]

Summary

This PR adds a comprehensive CONTRIBUTING.md file to help onboard developers to AgentCircle's mission of building the trust and payment layer for AI agents.

What's Included

• Getting Started: Prerequisites, quick start guide, and environment setup including TEE configuration
• Development Setup: Instructions for smart contract development (Foundry), frontend, and TEE environment
• Project Structure: Clear overview of the codebase organization
• Contributing Workflow: Branch naming conventions, commit message format, and PR process
• Coding Standards: Solidity and TypeScript guidelines with examples
• Testing: Unit tests, integration tests, and frontend testing patterns
• Security: Vulnerability reporting process and security best practices for TEE and smart contracts
• Community: Communication channels and getting help
• Bounty Program: Information about the bounty program with reward tiers

Why This Matters

As a protocol enabling AI agent policy sharing with TEE enforcement and on-chain receipts, clear contribution guidelines are essential for:

• Attracting developers interested in AI agent trust infrastructure
• Maintaining security for financial transactions between agents
• Ensuring proper TEE attestation handling
• Building a community around ERC-8004 and agent interoperability standards

The guidelines are specifically tailored for:

• TEE (Trusted Execution Environment) development
• Lit Protocol integration
• Filecoin + Base multi-chain architecture
• AI agent policy attestation (ERC-8004)
• Hypercerts and agent reputation systems

Checklist

• Follows conventional commits style
• Includes TEE-specific development guidance
• Provides clear examples for Solidity/TypeScript
• Addresses security considerations for agent trust protocols
• Documents bounty program and recognition

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Happy to address any feedback! This is an exciting project at the intersection of AI agents, TEEs, and Web3. 🚀

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