Added my name to the contributors list.

[Dhairya-Khara]

Motivation and Context

Your Changes

Description:
Added my name in doc/markus-contributors.txt following the alphabetical convention used in the document.

Type of change (select all that apply):

• Other (please specify): Updating contributor list.

Testing

The code was unchanged. Nevertheless, the RSpec and Jest test suites were still ran and they passed.

Checklist

• I have performed a self-review of my own code.
• I have verified that the pre-commit.ci checks have passed.
• I have verified that the CI tests have passed.
• I have reviewed the test coverage changes reported on Coveralls.