Update CONTRIBUTORS.md - for PR #57

[BharatKumarEY]

Update in contributors file for the approved PR #57

Description

Adding the name in the contributors list

Related Issue

Please link to the issue here: https://github.com/Nike-Inc/spark-expectations/issues/56

Motivation and Context

Feature is already merged, context of this PR is to just add the name into contributors.md file

How Has This Been Tested?

Testing documents already submitted in PR #57 - This is just for adding name into contributors list

Screenshots (if appropriate):

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [x] I have added tests to cover my changes.
• [x] All new and existing tests passed.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (6d546bb) 100.00% compared to head (994e143) 100.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #59 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 22 22 Lines 1441 1441 ========================================= Hits 1441 1441 ```

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