added docs for worker_dataset

[bashirk]

Description

This PR adds inline documentation to the worker_dataset.py file.

Relevant Issue

Issue #269

Checklist

• [x] I have followed the Contribution Guidelines and Code of Conduct
• [x] I have commented my code following the NimbleEdge Styleguide

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[ramesht007]

This module is now closing this PR. thanks !!