MetadataDescription
public class MetadataDescription : NSObject, CodableThe MetadataDescription object is used to describe content.
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                  A dictionary of metadata. Remark - The metadata key is to be passed as a dictionary key. The key must be of type String.
- The metadata value is to be passed as a dictionary value. The value must be of type Any.
 DeclarationSwift public var metadataKeys: [String : Any]?
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                  The title of the content. DeclarationSwift public var title: String?
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                  Constructs a MetadataDescription object. DeclarationSwift public init(metadataKeys: [String : Any]?, title: String? = nil)ParametersmetadataKeysA dictionary of metadata. titleThe title of the content, defaults to nil. 
