TOPIC: updated readme.md to include fetch surrounding chunks (elastic…

…#273)

* updated readme.md to include fetch surrounding chunks

updated readme.md to include example of fetch surrounding chunks

* Update README.md

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Co-authored-by: Joe McElroy <joseph.mcelroy@elastic.co>

README.md

@@ -44,6 +44,7 @@ The [`notebooks`](notebooks/README.md) folder contains a range of executable Pyt
 - [`Document Chunking with Ingest Pipelines`](./notebooks/document-chunking/with-index-pipelines.ipynb)
 - [`Document Chunking with LangChain Splitters`](./notebooks/document-chunking/with-langchain-splitters.ipynb)
 - [`Calculating tokens for Semantic Search (ELSER and E5)`](./notebooks/document-chunking/tokenization.ipynb)
+- [`Fetch surrounding chucks`](./supporting-blog-content/fetch-surrounding-chunks/fetch-surrounding-chunks.ipynb)
 
 ### Search