Add Qdrant notebooks

[kacperlukawski]

This PR adds two additional notebooks on how to use Qdrant as a vector database with OpenAI embeddings. The changes include the following:

• "Getting started with Qdrant and OpenAI" notebook with end-to-end processing of search using the embeddings
• "QA with Langchain Qdrant and OpenAI" notebook with an example of using Qdrant and OpenAI in a Langchain application to create a Question-Answering system. The library is becoming popular, and due to many questions around that, I want to show that case.

@colin-openai, Could you please review the notebooks?

[kacperlukawski]

@logankilpatrick @ted-at-openai @colin-openai Hi guys, could somebody have a look at the notebooks?

[kacperlukawski]

@colin-openai The changes have been made. I'd appreciate another review ;)