Collect datapackage.json metadata

- https://dataprotocols.org/data-packages/
- https://specs.frictionlessdata.io/data-package/
- https://specs.frictionlessdata.io/schemas/data-package.json
- https://github.com/search?l=&q=filename%3Adatapackage.json&type=code
-
An example: http://datasets.datalad.org/datapackage.json
```JSON
{
"name": "datalad-datasets",
"datapackage_version": "3",
"title": "The Ultimate DataLad collection of datasets",
"licenses": [{
"name": "ODC-PDDL-1.0",
"path": "http://opendatacommons.org/licenses/pddl/",
"title": "Open Data Commons Public Domain Dedication and License v1.0"
},
{
"title": "varying per each dataset"
}
]
}

```