How to contribute towers?

More of a question than an issue.

I assume I can't just for warriorjs, add my tower to it, and submit a pull request. I scoured npmjs.com for warriorjs modules, but I only found the official ones. If I were to create my own tower module, should I publish it on npm as a standalone package, or should I add it to this repo in a pull request after a review process? Will warriorjs find my module automatically on npm, or will people have to download it manually and paste it?