Add Litmus MCP Server to README

[vish74]

Description

Adding official Litmus MCP server to the list of Third-Party Servers. Using MCP server Litmus Edge provides Industrial Data Collection, Edge Analytics & Industrial AI.

Server Details

• Server: litmus-mcp-server
• Changes to: readme

Motivation and Context

The official Litmus Automation Model Context Protocol (MCP) Server enables LLMs and intelligent systems to interact with Litmus Edge for industrial data collection, device configuration, monitoring, and management. It is built on top of the MCP SDK and adheres to the Model Context Protocol spec.

How Has This Been Tested?

Extensively tested with:

• Cursor IDE
• Claude Desktop
• VS Code / Copilot
• Windsurf

Breaking Changes

N/A

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

[vish74]

This PR is ready, please review it.
Thanks you team for maintaining this repo ! @cliffhall @tadasant @evalstate

[cliffhall]

LGTM! 👍