feat: add .env.example and python-dotenv support for easier local setup

[MuhammedSenn]

• Adds .env.example as a template showing all required environment variables
• Adds python-dotenv so .env is automatically loaded on startup
• Updates README.md with a new "Using a .env file" section (Section C)
• Removes the need to manually export env vars each terminal session

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[gemini-code-assist]

Summary of Changes

Hello @MuhammedSenn, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the developer experience for local setup by integrating python-dotenv. It streamlines the process of managing environment variables, making it easier for new contributors to get started and for existing developers to switch between projects without manually configuring their shell environment. The addition of an example .env file and updated documentation ensures clarity and ease of use.

Highlights

• Simplified Local Setup: Introduced support for .env files, allowing environment variables to be loaded automatically on startup, removing the need for manual exports.
• Environment Variable Template: Added a .env.example file to provide a clear template of all required environment variables for the project.
• Updated Documentation: The README.md has been updated with a new section (Section C) detailing how to use the .env file for local development.

Changelog

• .env.example
  • Added a template file listing all necessary environment variables for project configuration.
• README.md
  • Added a new section (Section C) titled "Using a .env file" with instructions for copying and populating the .env file.
  • Included a note explaining that the project will automatically load environment variables from the .env file.
• main.py
  • Imported load_dotenv from the dotenv library.
  • Called load_dotenv() at the beginning of the script to automatically load environment variables.
• requirements.txt
  • Added python-dotenv to the list of project dependencies.

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[gemini-code-assist]

Code Review

This pull request introduces support for .env files using python-dotenv, which is a great improvement for simplifying local development setup. The changes include adding a .env.example template, updating the README.md with instructions, and modifying main.py to automatically load the environment variables. My review includes a couple of suggestions to improve code consistency and ensure reproducible builds.