METADATA and package file

[pathumego]

So the metadata file in the fontpackage is important. I really like the package.json in npm as the base instead of the current METADATA.yaml standard used in UFR. This way we can define a set of standard fields and also have fontman specific data as well.

Fonts itself has metadata and we have to always build the package file from the fontfiles and other files such as CONTRIBUTORS and AUTHORS and other metadata.