Add support for Anthropic Claude models (microsoft#2245)

* init notebook

* move notebook to website, remove set your api section

* add link to claude page

* replace config_from_json of raw python config

* update cost

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Co-authored-by: Eric Zhu <[email protected]>

Author: levscaut

website/docs/topics/non-openai-models/about-using-nonopenai-models.md

@@ -35,6 +35,7 @@ are provided below:
 
 - [Together AI example](/docs/topics/non-openai-models/cloud-togetherai)
 - [Mistral AI example](/docs/topics/non-openai-models/cloud-mistralai)
+- [Anthropic Claude example](/docs/topics/non-openai-models/cloud-anthropic)
 
 
 ### Locally run proxy servers