Add more than one contributor and additional information about contributor to datapackage

[jen-thomas]

Overview

In the Frictionless Data Package schema, the field contributors is an array, permitting more than one contributor. Currently it is possible to enter only one contributor which is automatically designated the role "author", through the UI.

It would be useful to be able to add

• multiple contributors
• designate their role (rather than automatically designating them as an author)
• add more information that meets the requirements of the optional fields in the schema, such as organisation

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