Add pyproject.toml with build-system metadata

[abdelkadermeflahi6-web]

Motivation

• Provide packaging metadata so the repository can be built as a Python project by declaring build requirements and basic project identity.

Description

• Add a root pyproject.toml containing [build-system] with requires = ["setuptools", "wheel"] and build-backend = "setuptools.backends.legacy:build", and a minimal [project] section with name = "greenflow" and version = "0.1.0".

Testing

• Inspected the created file with nl -ba pyproject.toml, which succeeded and showed the expected entries.
• Attempted a TOML parse using python3 and tomllib, which failed because the environment lacks the tomllib module so automated parsing could not be completed.

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Codex Task

[chatgpt-codex-connector]

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