Mark license to the package.json

[paazmaya]

Mark the MIT license to the package.json so that it can be found via different tools.
https://docs.npmjs.com/files/package.json#license

[edgan]

If you are going to use the MIT license there requirements are higher than just declaring it in the package.json. You need to have a full copy of the license in the repository as a file. In addition to be in full compliance you need to include a copy of the license with all downloads like installs from npm or yarn.

Would a PR help get this done?