One of the questions we've been getting from developers is, "How do I build a project or item template?"
Our Dev lead, Pedro Silva put together four great blogs on how to create, build, and share your template on the Visual Studio Gallery.
Creating an Item Template:
The blog posts are about creating an item template but the steps are very similar if you want to create a project template.
Take a look at his detailed blog post and start building your own templates! :)