feat: Create Embedding Tutorial

[lsetiawan]

Overview

After @anujsinha3 have done such a thorough investigation on embedding models on issue #6, we need to put together a comprehensive tutorial on this.

Outline

• What are embeddings?
• Importance of embeddings in RAG applications
• How to choose the right open-source embedding model for your RAG application.
• Evaluating embedding models: what to look out for? performance considerations?

[lsetiawan]

Example tutorial by MongoDB: https://www.mongodb.com/developer/products/atlas/choose-embedding-model-rag

[atambay37]

45

[lsetiawan]

Completed in https://github.com/uw-ssec/tutorials/pull/34