Add Ahsan Hassan as a mentor

[ahsanatzapier]

Description

In this PR, ahsan is added to CONTRIBUTORS.md in line with the steps provided here: https://github.com/the-collab-lab/tcl-75-smart-shopping-list?tab=readme-ov-file#make-your-first-contribution

Acceptance Criteria

• Ahsan is in the file with the link to the GitHub repo

Type of Changes

enhancement

Updates

Before

Ahsan was not in the CONTRIBUTORS file.

After

Ahsan is in the CONTRIBUTORS fire.

Testing Steps / QA Criteria

• Verify that Ahsan appears in the CONTRIBUTORS file.

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