Added MCP Plexus to the list of MCP server frameworks. (#281)

Added MCP Plexus to the list of MCP server frameworks. MCP Plexus is a secure and scalable multi-tenant Python framework built on FastMCP 2.7. It simplifies the deployment of sophisticated MCP servers, enabling robust multi-tenancy, seamless OAuth 2.1 integrations, persistent user authentication, and API key management. Ideal for developing modern, context-rich AI applications while ensuring security and extensibility.

README.md

@@ -396,6 +396,7 @@ A growing set of community-developed and maintained servers demonstrates various
 - **[create-mcp-ts](https://github.com/stephencme/create-mcp-ts)** - Create a new MCP server in TypeScript, batteries included - supports user-defined templates!
 - **[LiteMCP](https://github.com/wong2/litemcp)** - A TypeScript framework for building MCP servers elegantly
 - **[mcp-framework](https://github.com/QuantGeekDev/mcp-framework)** - Fast and elegant Typescript framework for building MCP servers
+- **[MCP Plexus](https://github.com/super-i-tech/mcp_plexus)**: A secure, **multi-tenant** Python MCP server framework built to integrate easily with external services via OAuth 2.1, offering scalable and robust solutions for managing complex AI applications.
 - **[oatpp-mcp](https://github.com/oatpp/oatpp-mcp)** - Anthropic's Model Context Protocol implementation for Oat++
 - **[centralmind/gateway](https://github.com/centralmind/gateway)** - CLI that generates MCP tools based on your Database schema and data using AI and host as REST, MCP or MCP-SSE server
 - **[ToolHive](https://github.com/Stacklok/toolhive)** - A lightweight utility designed to simplify the deployment and management of MCP servers, ensuring ease of use, consistency, and security through containerization