docs(demo example): Add restaurant AI agent demo featuring Langgraph (#123)

Add github repository link to demo showcasing agentic-ai powered restaurant discovery and reservations assistant.

Author: booleanhunter

README.md

@@ -55,6 +55,7 @@ No faster way to get started than by diving in and playing around with a demo.
 | [From Postgres to Redis Cloud with RDI](https://github.com/redis-developer/speedup-slowapp-with-redis-di) | This demo shows how to deploy RDI on Kubernetes running locally so it can be used to build a moving/transformation data pipeline to enable data on Redis Cloud. The source database lives on-premises, and the data is movied and transformed to Redis Cloud.                                                                           |
 | [Virtual Banking Assistant with Semantic Router](https://github.com/redis-developer/banking-agent-semantic-routing-demo) | A Banking Agent demo that uses semantic routing to route user queries to right banking tool. (Eg: Credit Card Recommendation, Loan EMI calculation, Banking FAQ etc)      
 | [Shopping AI Agent](https://github.com/redis-developer/shopping-ai-agent-langgraph-js-demo) | An Agentic AI grocery-shopping platform demo that combines Redis's speed with LangGraph's workflow orchestration. Get personalized recipe recommendations, smart product suggestions, and lightning-fast responses through semantic caching.                                                                   |
+| [Restaurant Discovery AI Agent](https://github.com/redis-developer/restaurant-discovery-ai-agent-demo) | An Agentic AI restaurant discovery platform that combines Redis's speed with LangGraph's intelligent workflow orchestration. Get personalized restaurant recommendations, make reservations, and get lightning-fast responses through semantic caching.                                                    |
 
 
 ## Recipes