Set up the project

[NikitaKurpas]

Closes #1

This PR sets up the basic project structure, including:

• Devcontainer config
• Streamlit as the UI framework
• LangChain and OpenAI as AI toolkits
• Qdrant as a vectorstore
  • I've suggested using Chroma, but I noticed that it was way too heavy, pulling in ~1.5 GB of dependencies. I've decided to use the lightweight Qdrant instead.
• TestQdrant notebook to test Qdrant connectivity, create a collection, and try querying it

There are few things left to change here, like the project name and project description, so let me know what I should put there.

[elliexcoding]

LGTM

[Konosh93]

There are few things left to change here, like the project name and project description, so let me know what I should put there.

Let's decide it later. I think it's better to keep it as is to use this commit for future projects.