Update README.md to include mcp-clickhouse

[iskakaushik]

Description

Link to the ClickHouse mcp-clickhouse repo from README.

Motivation and Context

This helps users find mcp-clickhouse.

How Has This Been Tested?

This has been tested with Claude Desktop application and there are also some automated tests in the repo.

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 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

[jspahrsummers]

[Claude] The ClickHouse MCP server is added to the official integrations section with a clear description. However, since this is in the official integrations section, it should include the company logo like other entries in this section. Please add the ClickHouse logo using the same format as other official integrations.