added docs for topology tree

[haripriya9647]

Description

added scala docs for topology tree data structure

Relevant Issue

Issue #132 the issue here

Affected Dependencies

List any dependencies that are required for this change - none

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 Please write proper description about the PR

[haripriya9647]

@divyanshugit fixed

[haripriya9647]

@divyanshugit tried fixing the alignment.