Restructure repository to match GF checklist

[m4rc1e]

We have a spec here

Copyright string should be:
Copyright 2017 The Barlow Project Authors (https://github.com/jpt/barlow)

This should also be the first line of the OTF.txt doc

The repo structure should look like the following examples:
Nunito, Montserrat

Font Metadata:

• Manufacturer and ManufacturerUrl can be the same as Designer and DesignerUrl.
• I'm happy with the default vertical metrics. However, we should lock these down so if we add glyphs in the future, the linespacing won't need to change.

In order to do this, we need to enable Use_Typo_Metrics

We also need to assign all the vertical metric values to each master. To match the same visual linespace and ensure future compatibility, the following values are needed:

typoAscender: 1000
typoDescender: -200
typoLineGap: 0
winAscent: 958 (family ymax bbox)
winDescent: 211 (family ymin bbox)
hheaAscander: 1000
hheaDescnder: -200

Hope this helps, cheers,
Marc

[jpt]

@m4rc1e I think this is done as of 1fd9e2e so I'm closing the issue but please re-open if there's anything in gf spec that I overlooked (there are no trademarks involved)