Add the draft work on SoSS+ as a proper MASP profile

[ptsefton]

Need to include definitions for the key building blocks: rdfs:Class, rdf:Property, DefinedTerm, ItemList and the mechanics of linking these into the profile/schema crate:

{ 
      "@id": "#hasSpecializedSchema",
      "@type": "ResourceDescriptor",
      "name": "Specialized Schema Terms",
      "hasRole": { "@id": "http://www.w3.org/ns/dx/prof/role/schema" },
      "hasPart": 
      [
        { "@id": "#RO-Crate_Metadata_Descriptor" },
        { "@id": "#RO-Crate_Metadata_Descriptor.id" },
        { "@id": "#RO-Crate_Metadata_Descriptor.about" },
        { "@id": "#Root_Data_Entity" },
        { "@id": "http://schema.org/name" },
        { "@id": "#prop_description_Dataset" },
        { "@id": "#prop_datePublised_Dataset" },
        { "@id": "#prop_license_Dataset" },
        { "@id": "#class_CreativeWorkLicense" }
      ]
    },