docs: add vsingk as a contributor for doc

[allcontributors]

Adds @vsingk as a contributor for doc.

This was requested by ryansurf in this comment

Summary by Sourcery

Add Varun Singh as a documentation contributor in the project's README.

Documentation:

• Add Varun Singh as a contributor for documentation in the README file.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request adds a new contributor, @vsingk, to the README.md file for their documentation contributions. The change is simple and straightforward, involving the addition of a single line in the contributors table.

No sequence diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Add a new contributor to the project	Insert a new table cell in the contributors table Add @vsingk's GitHub avatar and profile link Include @vsingk's name (Varun Singh) Specify the contribution type as documentation (📖)	README.md

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[sourcery-ai]

We have skipped reviewing this pull request. It seems to have been created by a bot (hey, allcontributors[bot]!). We assume it knows what it's doing!