Add Sampleable conformance to Unidentified. Rename file slightly.

Sources/JSONAPIOpenAPI/Sampleable/JSONAPI+Sampleable.swift

@@ -0,0 +1,68 @@
+//
+//  JSONAPI+Sampleable.swift
+//  JSONAPIOpenAPI
+//
+//  Created by Mathew Polzin on 1/24/19.
+//
+
+import JSONAPI
+
+extension NoAttributes: Sampleable {
+	public static var sample: NoAttributes {
+		return .none
+	}
+}
+
+extension NoRelationships: Sampleable {
+	public static var sample: NoRelationships {
+		return .none
+	}
+}
+
+extension NoMetadata: Sampleable {
+	public static var sample: NoMetadata {
+		return .none
+	}
+}
+
+extension NoLinks: Sampleable {
+	public static var sample: NoLinks {
+		return .none
+	}
+}
+
+extension NoAPIDescription: Sampleable {
+	public static var sample: NoAPIDescription {
+		return .none
+	}
+}
+
+extension UnknownJSONAPIError: Sampleable {
+	public static var sample: UnknownJSONAPIError {
+		return .unknownError
+	}
+}
+
+extension Unidentified: Sampleable {
+	public static var sample: Unidentified {
+		return Unidentified()
+	}
+}
+
+extension Attribute: Sampleable where RawValue: Sampleable {
+	public static var sample: Attribute<RawValue> {
+		return .init(value: RawValue.sample)
+	}
+}
+
+extension SingleResourceBody: Sampleable where Entity: Sampleable {
+	public static var sample: SingleResourceBody<Entity> {
+		return .init(entity: Entity.sample)
+	}
+}
+
+extension ManyResourceBody: Sampleable where Entity: Sampleable {
+	public static var sample: ManyResourceBody<Entity> {
+		return .init(entities: Entity.samples)
+	}
+}