Add Riza's MCP server to README

Author: andrewmbenton

README.md

@@ -63,6 +63,7 @@ Official integrations are maintained by companies building production ready MCP
 - <img height="12" width="12" src="https://pics.fatwang2.com/56912e614b35093426c515860f9f2234.svg" /> [Search1API](https://github.com/fatwang2/search1api-mcp) - One API for Search, Crawling, and Sitemaps
 - <img height="12" width="12" src="https://www.tinybird.co/favicon.ico" alt="Tinybird Logo" /> **[Tinybird](https://github.com/tinybirdco/mcp-tinybird)** - Interact with Tinybird serverless ClickHouse platform
 - <img height="12" width="12" src="https://verodat.io/assets/favicon-16x16.png" alt="Verodat Logo" /> **[Verodat](https://github.com/ThinkEvolveSolve/verodat-mcp-server)** - Interact with Verodat AI Ready Data platform
+- <img height="12" width="12" src="https://riza.io/favicon.ico" alt="Riza logo" /> **[Riza](https://github.com/riza-io/riza-mcp)** - Arbitrary code execution and tool-use platform for LLMs by [Riza](https://riza.io)
 
 ### 🌎 Community Servers