docs: adds Reaper MCP Server to README

[dschuler36]

Description

Adds a link to the Reaper MCP Server in the README.

Server Details

N/A

Motivation and Context

Enables users to ask questions about their Reaper projects with MCP Clients.

How Has This Been Tested?

Tested locally using Claude Desktop.

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

[jerome3o-anthropic]

very neat!