Project: Agentic Professor
Section: Backend

Description
The .env.example file is missing from the backend directory. This file is essential for setting up environment variables, including API keys and other configurations needed to run the project locally. Without it, it’s unclear which environment variables need to be defined.

Expected Solution
Please add a .env.example file to the backend section of the repository with placeholder values for required environment variables. This will help contributors and users configure their environment correctly before running the project.