Add License for Template

[awhitford]

• Added the MIT License to this Template project (consistent with Svelte's License)
• degit will automatically remove the LICENSE.md file
• Resolves #78

[Conduitry]

I'm concerned now though about people having a stray useless degit.json file if they clone this repo in another way (or if they use GitHub's 'repo template' feature).

[antony]

The alternative is to remove that file and have a stray license file, which, on the face of it, seems like a reasonable thing to have in a template.

Alternatively can we put the degit config into package.json instead?

update: looks like we cannot. reverting to previous suggestion of just including a permissive license file :)

[rob-3]

Is there any reason this PR hasn't been merged? If there's concern about clutter files in the repo, one option is to list the license in the README or release it under a public domain equivalent license like 0BSD that doesn't have to be present in downstream repos.