[IMPROVEMENT] Add pytest to test requirements and document Windows test setup

[ObaidAbdullah16]

PR Title: [IMPROVEMENT] Add pytest to test requirements and document Windows test setup

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Summary

This PR improves the contributor/developer experience on Windows by ensuring the test runner is available after installing test dependencies, and by documenting a working Windows (Git Bash) setup.

Changes

• Add pytest to test-requirements.txt so python -m pytest works after installing test dependencies.
• Add a short README section with Windows (Git Bash) commands to create a venv, install dependencies, and run the unit tests.

Motivation / Context

While setting up the project on Windows (Git Bash) inside a virtual environment, I ran:

python -m pip install -r test-requirements.txt
python -m pytest -q --maxfail=1

and got the error:

No module named pytest

This PR makes that workflow work out-of-the-box by including pytest in test-requirements.txt, and documents the Windows setup steps so new contributors don’t get blocked.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[ObaidAbdullah16]

Hi @canihavesomecoffee @thealphadollar — whenever you have a moment, could you please review this PR?
It adds pytest to the test requirements and updates the Windows testing setup docs. Thanks!