resolves #45 add prompt for license (PR #60)
resolves #45 add prompt for license (PR #60)

- add prompt for license
- default to UNLICENSED
- reference license identifier list at https://spdx.org/licenses
bespokejs/generator-bespoke,markdalgleish/generator-bespoke,markdalgleish/generator-bespoke,markdalgleish/generator-bespoke,bespokejs/generator-bespoke,bespokejs/generator-bespoke