Add AGENTS.md

[devcrocod]

Introduce AGENTS.md documenting repository layout, build/test commands, API compatibility checks, code conventions, logging/error handling guidance, and the PR/review checklist for the Kotlin MCP SDK.

Motivation and Context

Provide a single, authoritative reference for code agents.

How Has This Been Tested?

Breaking Changes

None

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Checklist

• I have read the MCP Documentation
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have added or updated documentation as needed

[Copilot]

Pull Request Overview

This PR adds AGENTS.md to document the Kotlin MCP SDK repository structure and development guidelines for code agents. The file serves as a comprehensive reference for contributors and automated tools working with the codebase.

Key Changes:

• Documents repository layout, build/test commands, and API compatibility workflow
• Establishes code conventions covering multiplatform patterns, serialization, concurrency, and error handling
• Defines PR submission requirements and review checklist

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