Add PDF reader MCP server to the README, enhancing the list of commun…

[gpetraroli]

…ity-developed servers.

Description

A simple MCP server with 3 tools:

1. read a local pdf file
2. search within a pdf file
3. get pdf metadata

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]

Thanks for your contribution to the servers list. This has been merged in this combined PR: #2143

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.