Yes, as long as it's clearly a _programming_ language, and [not purely configuration or markup][6060].  From your description of Asymptote, it sounds that it is fine in this respect.

You should be able to write a new tag of your own choosing in the "tags" box - if not, then post without it and then flag your question for moderator assistance.

Fair warning: you might need some patience waiting for reviews if the language isn't well-known.  Don't let that put you off!

[6060]:/q/6060/75307