docs: add Standard Korean Dictionary MCP server to the README

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Description

Add Standard Korean Dictionary MCP server that integrates with the Korean dictionary API (국립국어원 표준국어대사전) for Korean language lookups

Server Details

• Server: stdict (new)
• Changes to: tools (search, detail)

Motivation and Context

This new server provides integration with the Standard Korean Dictionary, allowing LLMs to look up accurate definitions, pronunciations, and usage examples for Korean words. This helps LLMs work more effectively with Korean language content by providing access to an authoritative Korean language resource.

How Has This Been Tested?

• Tested with Claude Desktop client
• Verified search functionality with various Korean words
• Tested advanced search parameters including part of speech, etymology type
• Verified detailed view functionality with both word_info and target_code methods

Breaking Changes

None. This is a new server that users can optionally add to their configurations.

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 Protocol Documentation
• My changes follows MCP security best practices
• I have updated the server's README accordingly
• I have tested this with an LLM client
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have documented all environment variables and configuration options

Additional context

• The server requires a Standard Korean Dictionary API key which users need to obtain from the National Institute of Korean Language
• API documentation can be found at https://stdict.korean.go.kr/openapi/openApiInfo.do
• All search parameters from the original API are supported
• Attribution requirements for dictionary content are included in the README