Update README.md add Prefect implementation

[allen-munsch]

updates README.md adds a working example of MCP for Prefect

Description

Server Details

• Server:
• Changes to:

Motivation and Context

• I've added a basic implementation of an Model Context Protocol (MCP) Server for Prefect PrefectHQ/prefect#17626

How Has This Been Tested?

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]

Hi, thanks for the PR and sorry for the wait - could you reorder this to be in alphabetical order? Thanks!

[allen-munsch]

@olaservo thanks, updated