How to tag users inside a file?

I’m wondering if it is possible to tag a user as we do in github issues, where it turns into a link and hovercard.

I tried adding @balupton to a README, but it just comes out as text.

Trial repo: readme-rounded-images/ at main · balupton/readme-rounded-images · GitHub

I bet it’s a parsing issue. Try removing the HTML card before the user tag (just as a test).

Also in the card HTML ampersand should be URL encoded not entity encoded.

Dear sir,
I need you guides