docs: add the rmcp-openapi and rmcp-actix-web related projects (#406)

* docs: add the rmcp-openapi and rmcp-actix-web related projects

* docs: separate "Extending `rmcp`" and "Built with `rmcp`" sections

Author: JMLX42

README.md

@@ -119,8 +119,17 @@ See [oauth_support](docs/OAUTH_SUPPORT.md) for details.
 - [Schema](https://github.com/modelcontextprotocol/specification/blob/main/schema/2024-11-05/schema.ts)
 
 ## Related Projects
+
+### Extending `rmcp`
+
+- [rmcp-actix-web](https://gitlab.com/lx-industries/rmcp-actix-web) - An `actix_web` backend for `rmcp`
+- [rmcp-openapi](https://gitlab.com/lx-industries/rmcp-openapi) - Transform OpenAPI definition endpoints into MCP tools
+
+### Built with `rmcp`
+
 - [rustfs-mcp](https://github.com/rustfs/rustfs/tree/main/crates/mcp) - High-performance MCP server providing S3-compatible object storage operations for AI/LLM integration
 - [containerd-mcp-server](https://github.com/jokemanfire/mcp-containerd) - A containerd-based MCP server implementation
+- [rmcp-openapi-server](https://gitlab.com/lx-industries/rmcp-openapi/-/tree/main/crates/rmcp-openapi-server) - High-performance MCP server that exposes OpenAPI definition endpoints as MCP tools
 
 ## Development