updated data_module folder

[haripriya9647]

Description

adding inline doc for all the classes and methods

Relevant Issue

Issue #276 the issue here

Affected Dependencies

List any dependencies that are required for this change.

How has this been tested?

• Describe the tests that you ran to verify your changes.
• Provide instructions so we can reproduce.
• List any relevant details for your test configuration.

Checklist

• [x] I have followed the Contribution Guidelines and Code of Conduct
• [x] I have commented my code following the NimbleEdge Styleguide
• [x] I have labeled this PR with the relevant Type labels
• [x] My changes are covered by tests

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[divyanshugit]

@haripriya9647 In this PR, please try to write the whole inline documentation inside the class. You can explain about methods inside it. Only write inline docs for methods if the code flow of the method is complex.

[divyanshugit]

Please utilize the 70 letters in each file.

[haripriya9647]

@divyanshugit i have added commits as per suggestions.Please review