added inline doc for criterio folder

[haripriya9647]

Description

added inline doc for criteio and femnist folder

Relevant Issue

Haven't opened any issue

Affected Dependencies

List any dependencies that are required for this change. - None

How has this been tested?

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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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