Add Mydentify to Product.md

[mitdralla]

What changed

Added Mydentify to the community Product Directory using the required six-column row template.

Submission checklist

• Checked that Mydentify is not already listed.
• Used the exact row template and appended it below the previous entry.
• Verified https://mydentify.com/ returns HTTP 200.
• Kept the description neutral and concise.
• Used a direct HTTPS URL with no referral or tracking parameters.

Full disclosure: this submission comes from Mydentify’s founder account.