adding readme to folder

recipes/3p_integrations/aws/README.md

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+In this folder, you'll find notebook examples enabling you to quickly getting started with Llama models with Amazon Bedrock and Sagemaker.
+
+Current notebooks include:
+* Getting Started with Llama on Amazon Bedrock
+* Prompt Engineering with Llama 3 - Using Amazon Bedrock + LangChain
+* RAG Introduction with Amazon Bedrock & Langchain