Add FPE Demo MCP to community servers

- Adds FF3 Format Preserving Encryption MCP server
- Demonstrates authentication patterns for secure data protection
- Positioned alphabetically in community servers section

README.md

@@ -685,6 +685,7 @@ A growing set of community-developed and maintained servers demonstrates various
 - **[Fastmail MCP](https://github.com/MadLlama25/fastmail-mcp)** - Access Fastmail via JMAP: list/search emails, send and move mail, handle attachments/threads, plus contacts and calendar tools.
 - **[fastn.ai – Unified API MCP Server](https://github.com/fastnai/mcp-fastn)** - A remote, dynamic MCP server with a unified API that connects to 1,000+ tools, actions, and workflows, featuring built-in authentication and monitoring.
 - **[FDIC BankFind MCP Server - (Unofficial)](https://github.com/clafollett/fdic-bank-find-mcp-server)** - The is a MCPserver that brings the power of FDIC BankFind APIs straight to your AI tools and workflows. Structured U.S. banking data, delivered with maximum vibes. 😎📊
+- **[FPE Demo MCP](https://github.com/Horizon-Digital-Engineering/fpe-demo-mcp)** - FF3 Format Preserving Encryption with authentication patterns for secure data protection in LLM workflows.
 - **[Federal Reserve Economic Data (FRED)](https://github.com/stefanoamorelli/fred-mcp-server)** (by Stefano Amorelli) - Community developed MCP server to interact with the Federal Reserve Economic Data.
 - **[Fetch](https://github.com/zcaceres/fetch-mcp)** - A server that flexibly fetches HTML, JSON, Markdown, or plaintext.
 - **[Feyod](https://github.com/jeroenvdmeer/feyod-mcp)** - A server that answers questions about football matches, and specialised in the football club Feyenoord.