Please how can i create a download link in an html file

Answer 1

Compress Your file to zip or rar and Directly write file path inside anchor tag.

Example:
<a href="files/data.rar"> Click Here To Download </a>

Answer 2

https://www.w3schools.com/tags/att_a_download.asp

The Code Playground probably has some feature that disables this though (to protect users from user-generated viruses maybe).