Added additional env vars & Airbnb data

HW.md

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+# HW 7: Solutions
+
+## Deliverables
+
+* Completed Notebook
+* Chainlit Application in a Hugging Face Space Powered by Hugging Face Endpoints
+* Screenshot of endpoint usage
+
+### Completed notebook
+
+[Located here](./Completed_BazeleyMikiko_Open_Source_RAG_Leveraging_Hugging_Face_Endpoints_through_LangChain.ipynb)
+[Also on HF space](https://huggingface.co/spaces/mmbazel/AIE3-Demo-Wk4Day1/blob/main/%5BCompleted%5D%20BazeleyMikiko_Open_Source_RAG_Leveraging_Hugging_Face_Endpoints_through_LangChain.ipynb)
+
+### Chainlit Application
+
+[Link to Chainlit App in HuggingFace Space](https://huggingface.co/spaces/mmbazel/AIE3-Demo-Wk4Day1)
+
+
+### Screenshots
+#### The chat 
+![alt text](img/chat.png)
+
+#### The trace
+![alt text](img/full_trace.png)
+
+#### The endpoints
+![alt text](img/endpoints.png)
+
+#### The LLM model endpoint
+![alt text](img/llm-endpoint.png)
+
+#### The embeddings model endpoint
+![alt text](img/embedding-endpoint.png)
+
+### The Loom video 
+https://www.loom.com/share/162d71e4d445442faa40dba76f4cbf13
+
+
+### Lessons Learned & Open Questions
+
+#### Lessons
+1. Learning how to translate notebook code into scripts.
+2. Learning/reminder that HF spaces can be used in dev mode and connected to VSCode.
+3. Learning how to setup LCEL RAG Chain.
+    - Understand how to deploy open-source LLMs & embedding models to scalable endpoints for production-grade LLM & RAG applications
+    - Build a RAG application with LCEL
+    - Build a front-end UI for RAG applications with Chainlit
+
+#### Questions
+1. What are the challenges using LangChain in production - see lots of folks complaining about it on LinkedIn and Twitter. 
+2. What complex RAG looks like.
+3. Have a basic understanding of the metrics used to monitor performance but still a novice with regards to LLM evals.
+