kusto vector sample added

examples/vector_databases/kusto/README.md

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+# Kusto as a Vector database
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+
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+[Azure Data Explorer aka Kusto](https://azure.microsoft.com/en-us/products/data-explorer) is a cloud-based data analytics service that enables users to perform advanced analytics on large datasets in real-time. It is particularly well-suited for handling large volumes of data, making it an excellent choice for storing and searching vectors.
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+Kusto supports a special data type called dynamic, which can store unstructured data such as arrays and properties bag. [Dynamic data type](https://learn.microsoft.com/en-us/azure/data-explorer/kusto/query/scalar-data-types/dynamic) is perfect for storing vector values. You can further augment the vector value by storing metadata related to the original object as separate columns in your table.  
+Kusto also supports in-built function [series_cosine_similarity_fl](https://learn.microsoft.com/en-us/azure/data-explorer/kusto/functions-library/series-cosine-similarity-fl) to perform vector similarity searches.
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+[Get started](https://aka.ms/kustofree) with Kusto for free. 
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+![Kusto_Vector](./images/kusto_vector_db.png)
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+
+
+## Getting started with Kusto and Open AI embedding
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+### Demo Scenario
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+![Wiki_embeddings](./images/wiki_embeddings.png)
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+![semantic_search_flow](./images/semantic_search_user_flow.png)
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+If you’d like to try this demo, please follow the instructions in the [Notebook](Getting_started_with_kusto_and_openai_embeddings.ipynb).
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+It will allow you to -  
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+1. Use precomputed embeddings created by OpenAI API. 
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+2. Store the embeddings in Kusto. 
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+3. Convert raw text query to an embedding with OpenAI API. 
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+4. Use Kusto to perform cosine similarity search in the stored embeddings.