Add more share types (#200)

Signed-off-by: Milen Pivchev <milen.pivchev@gmail.com>

Author: mpivchev

Sources/NextcloudKit/Models/NKShare.swift

@@ -92,6 +92,16 @@ public final class NKShare: NSObject {
         ///
         case team = 7
 
+        ///
+        /// Shared by a guest.
+        ///
+        case guest = 8
+
+        ///
+        /// A federated group share.
+        ///
+        case federatedGroup = 9
+
         ///
         /// Shared within a Nextcloud Talk conversation.
         ///