add component.json

to make it really easy to install for people using [`component`](https://github.com/component/component)

also, i'd advise tagging your releases as `1.2.0` instead of `v1.2` to fit in with semver and the way most repos are tagged, since that string is used directly to grab the files

for an example of another typeface component, checkout https://github.com/typefaces/source-sans-regular