Update README.md to add official Token Metrics MCP server

[suleman1220]

Description

This PR aims to add Token Metrics 's MCP server to the official server list in README.md.
It follows the existing format and styling, enabling contributors to find and utilize the Token Metrics MCP server quickly.

Motivation and Context

The Token Metrics Model Context Protocol (MCP) server provides comprehensive cryptocurrency data, analytics, and insights through function calling. This server enables AI assistants and agents to access Token Metrics' powerful API for real-time crypto market data, trading signals, price predictions, and advanced analytics.

How Has This Been Tested?

Verified that the README update renders correctly in GitHub's Markdown preview.

Breaking Changes

None. This PR only updates the list in README.md.

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: #2264

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.