This commit introduces a new MCP-based matchmaking server.
It replaces the previous weather-based example with a fully functional
matchmaking service that includes three main tools:

- `announce_agent`: Allows an agent to register and receive a unique
  fingerprint.
- `get_potential_match`: Provides a potential match for a registered
  agent.
- `establish_match`: Confirms a match between two agents, preventing
  them from being matched again.

The implementation uses an in-memory dictionary for storing agent data
and matches.

The README.md has been completely rewritten to reflect the new
functionality, including an architectural diagram and API documentation.