added retriever improvements (#13)

There are 3 notebooks here
1. build datasets
2. run a baseline

the goal is to use Metrics Driven Development with Langchain and
Langsmith to do the evaluation.

You can see the live notebook
[here](https://notesexplodinggradientscom--13.org.readthedocs.build/en/13/intro.html)

---------

Co-authored-by: William FH <[email protected]>

Author: jjmachan

RAG-Experiments/basecamp-handbook/README.md

@@ -1,3 +1,3 @@
 # Basecamp Handbook
 
-Let's build a RAG over the basecamp handbook.
+Let's build a RAG over the basecamp handbook and use Metrics Driven Development to syste  matically improve it.