Add Uno Platform MCP

[vatsashah45]

Description

This PR adds a new Uno Platform MCP server, enabling AI agents and developers connect directly to Uno Platform's complete knowledge base - documentation, APIs, and best practices with structured, semantic access, allowing for for creation of cross-platform .NET applications.

Server Details

N/A - This is a resource addition to the Resources section, not a server implementation change.

Motivation and Context

Adding the Uno MCP to the registry makes it discoverable and usable by the wider MCP ecosystem.
It provides standardized access to the full Uno Platform knowledge base, improving LLM-driven development workflows and enabling richer agentic tooling for .NET cross-platform apps.

How Has This Been Tested?

N/A - This is a documentation update adding a resource link. The Uno MCP itself has been tested in production with multiple LLM's and agents.

Breaking Changes

None. This is a documentation-only change adding a resource link.

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

[domdomegg]

Thanks! The description is a little long - longer than all the others there. Can we make this more consistent with the other entries?

Additionally the link https://mcp-docs.platform.uno/v1 doesn't appear to work for me - can you check this?