Add OpenMetadata MCP server

[yangkyeongmo]

Description

This is a proposal to add an OpenMetadata MCP server. This server is already registered in multiple MCP server registry.
OpenMetadata MCP server provides what OpenMetadata API supports.

Server Details

• Server:
• Changes to:

Motivation and Context

How Has This Been Tested?

Breaking Changes

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

[Copilot]

Pull Request Overview

This PR adds an entry for an OpenMetadata MCP server to the community servers list, expanding the registry to include metadata management capabilities.

• Introduces a new bullet in the README listing the OpenMetadata MCP server.
• Provides the repository link and a brief description of the server’s purpose.

Comments suppressed due to low confidence (1)

README.md:712

• [nitpick] Consider adding a brief usage example or link to detailed documentation for the OpenMetadata MCP server entry to help users understand how to get started and what specific capabilities are supported.

- **[OpenMetadata](https://github.com/yangkyeongmo/mcp-server-openmetadata)** - MCP Server for OpenMetadata, an open-source metadata management platform.