Add semantic routing example (#57)

* add routing notebook

Author: rbs333

README.md

@@ -80,6 +80,13 @@ An estimated 31% of LLM queries are potentially redundant ([source](https://arxi
 | [/semantic-cache/doc2cache_llama3_1.ipynb](python-recipes/semantic-cache/doc2cache_llama3_1.ipynb) | Build a semantic cache using the Doc2Cache framework and Llama3.1 |
 | [/semantic-cache/semantic_caching_gemini.ipynb](python-recipes/semantic-cache/semantic_caching_gemini.ipynb) | Build a semantic cache with Redis and Google Gemini |
 
+### Semantic Routing
+Routing is a simple and effective way of preventing misuses with your AI application or for creating branching logic between data sources etc.
+
+| Recipe | Description |
+| --- | --- |
+| [/semantic-router/00_semantic_routing.ipynb](python-recipes/semantic-router/00_semantic_routing.ipynb) | Simple examples of how to build an allow/block list router in addition to a multi-topic router |
+
 ### Agents
 
 | Recipe | Description |