example: added example using document loading (PDF)

[AnthonyDasse]

PR Checklist

• Read the Contributing documentation.
• Read the Code of conduct documentation.
• Name your Pull Request title clearly, concisely, and prefixed with the name of the primarily affected package you changed according to Good commit messages (such as memory: add interfaces for X, Y or util: add whizzbang helpers).
• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. Fixes #123).
• Describes the source of new concepts.
• References existing implementations as appropriate.
• Contains test coverage for new functions.
• Passes all golangci-lint checks.

Explanation

This example present the integration of Langchain with Ollama while showcasing the use of a PDF document to enrich the context.

Actually, the PDF of the example contains 1 page and contains information from Langchain documentation.

Steps of the example :

1. Load documents (for the context) from the PDF file
2. Initialize the llm and the chain
3. Prompt the model with context loads from the PDF

The prompt targets a question where the answer is contained in the context.

Prerequisites

This example uses Ollama as the LLM engine.
So, you should install it. You can find all informations here.

[devalexandre]

you cheked

Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. Fixes #123).

but not write the issue number.

[AnthonyDasse]

@devalexandre , sorry .
Error on my side. I corrected the list (checked/not checked)

[AnthonyDasse]

Hello. @devalexandre . do you know when PR will be merged?

[devalexandre]

Hello. @devalexandre . do you know when PR will be merged?

only @tmc can do it

[AnthonyDasse]

Hello @tmc, do you know when PR will be merged?