Requested workflow run

[EttoreM]

This PR addresses #30

Rules implemented

Description	sh:severity
RO-Crate MUST contain at least one CreateAction entity.	sh:Violation
RootDataEntity MUST have the schema:mentions property	sh:Violation
RootDataEntity --> schema:mentions MUST point to a schema:CreateAction entity	sh:Violation
CreateAction MUST have the schema:instrument property	sh:Violation
CreateAction --> instrument MUST (also) reference mainEntity	sh:Violation
CreateAction SHOULD have the property object with IRI values.	sh:Warning
Each object in CreateAction MUST reference an existing entity.	sh:Violation

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Rules NOT implemented

The following rule was not implemented due to ambiguity on how to define "UUID-based URI fragment"

Description	sh:severity
The @id of CreateAction SHOULD be a UUID-based URI fragment (e.g. #query-...), different from the BagIt External-Identifier.	sh:Warning