Missing in v1: Distribution property and Download

[ptsefton]

Describe the bug

The DataCrate Spec mentions the distribution property, pointing to a DataDownload Contextual entity. This is used by Google Dataset search. We lost this somewhere in the editing process.

DataCrates which are packaged for distribution SHOULD:

Have a DOI as an identifier.
Use the DOI URL as the @id.
Include the DOI without a URL as an identifier.
Link to a DataDownload using the distribution property.
{
    "@id": "https://doi.org/10.4225/59/59672c09f4a4b",
    "@type": "Dataset",
    "citation": {
        "@id": "https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0181020"
    },
    "path": "data/",
    "datePublished": "2017",
    "description": "Palliative care planning for nursing home residents with advanced dementia is often suboptimal. This study compared effects of facilitated case conferencing (FCC) with usual care (UC) on end-of-life care",
     
    "identifier": [
        "https://doi.org/10.4225/59/59672c09f4a4b",
        "doi.org/10.4225/59/59672c09f4a4b"
    ],
    "name": "Data files associated with the manuscript:Effects of facilitated family case conferencing for advanced dementia: A cluster randomised clinical trial",
    "distribution": [
        {
            "@id": "https://data.research.uts.edu.au/examples/v1.0/timluckett.zip"
        }
    ]
}

{
    "@id": "https://data.research.uts.edu.au/examples/v1.0/timluckett.zip",
    "contentUrl": "https://data.research.uts.edu.au/examples/v1.0/timluckett.zip",
    "@type": "DataDownload",
    "encodingFormat": "zip"
}

URL Provide link to RO-Lite page or source code most related to the bug.

Suggested fix

Add in the example above.

Additional context

See the DataCrate spec (which RO-Crate replaces).