template for new project .config/dub/template/

[vitalfadeev]

Hi.

Create, please, program for take template from "~/.config/dub/template/" and put into new project.

Example:

.config/
  dub/
    template/
      source
        main.d
      dub.json

on dub init:

cp .config/dub/template/* .

then update dub.json from answers.

Because, I reuse custom main.d.