docs: Update README.md to add link to trello mcp server

[lioarce01]

Description

Added a link to a trello mcp server of my own on README file

Server Details

• Server: none
• Changes to: README.md file

Motivation and Context

I had not seen any mcp servers for trello yet and wanted to add the one I developed: D

How Has This Been Tested?

The trello mcp server was tested with claude desktop and github copilot with vscode.

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

[olaservo]

Thanks for your contribution to the servers list. This has been merged in this combined PR: #2007

This is a new process we're trying out, so if you see any issues feel free to re-open the PR and tag me.