Title: Add "Setting Up a Local Development Environment" to README

[APolevanov]

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This pull request adds a new section titled "Setting Up a Local Development Environment" to the README.md file. This section provides clear instructions for contributors on how to set up a local development environment for the Requests project. The addition of this section will make it easier for new contributors to get started with the project and ensure a smooth onboarding process.

The new section includes:

Instructions on installing necessary dependencies
Cloning the repository
Creating and activating a virtual environment
Installing project requirements
Running tests

By providing this information in the README.md, we aim to lower the barrier to entry for potential contributors and make the project more accessible to developers of all experience levels.

Please review the changes and let me know if you have any suggestions or require further modifications. I'm more than happy to make any necessary adjustments. Thank you for considering this contribution!