Support syntax highlighting and detection of TL-Verilog by GitHub

[shivampotdar]

https://github.com/github/linguist/blob/master/CONTRIBUTING.md#adding-a-language
https://docs.github.com/en/github/creating-cloning-and-archiving-repositories/about-repository-languages

[adamint]

github-linguist/linguist#5331

[deepu-bansal]

Hey, I am not able to mark in which code we have to make changes . Can you help me out pls?

[stevehoover]

This issue is a bit out of place. In any case, the pull request is complete and was rejected based on the amount of TL-Verilog code in the wild. There's more now, so we could retry w/ linguist.

[stevehoover]

(nothing for you to do on this, @deepu-bansal )