Mono-D/Xamarin - No dub file?

[Gan via Digitalmars-d-ide]

I created a new D language project in Xamarin with the D language 
binding. I've been making a project and am at the point where I 
want to add a dub library.

It says to add:
"dependencies": {
		"dbox": ">=0.0.7-alpha"
	}

in the dub file but my project wasn't created with a dub file. 
How do I include the dependency?