Populate datalad metadata to enable searching

[MattF-NSIDC]

e.g. We may want users to be able to search the available cryo-data collections by the collection's title or description (from CMR)

[mankoff]

See http://docs.datalad.org/en/stable/metadata.html and https://github.com/datalad/datalad-metalad

[mankoff]

It looks like the datalad catalog might be the right tool to use, rather than metalad

Source: https://github.com/datalad/datalad-catalog
Example: https://datalad.github.io/datalad-catalog/