add to Textual gallery

[zachvalenta]

https://www.textualize.io/gallery-instructions

Figure more people will be exposed to the project there as well.

[Cvaniak]

I have already done PR Textualize/textualize.io#123 .
But looking on other issues, it requires some patience.
Thank you for thinking highly of this project!

[zachvalenta]

Aha, ok, didn't see you in the gallery so figured hadn't already submitted yet. Good to hear!