Open Science Framework - Create a contributor

Adds a contributor to a node, effectively creating a relationship between the node and a user. Contributors are users who can make changes to the node or, in the case of private nodes, have read access to the node. Contributors are categorized as either "bibliographic" or "non-bibliographic" contributors. From a permissions standpoint, both are the same, but bibliographic contributors are included in citations and are listed on the project overview page on the OSF, while non-bibliographic contributors are not. #### Permissions Only project administrators can add contributors to a node. #### Required A relationship object with a `data` key, containing the `users` type and valid user ID is required. All attributes describing the relationship between the node and the user are optional. #### Returns Returns a JSON object with a `data` key containing the representation of the new contributor, if the request is successful. If the request is unsuccessful, an `errors` key containing information about the failure will be returned. Refer to the [list of error codes](#Introduction_error_codes) to understand why this request may have failed.