Add minimal version of contract import

Hcs.Client/Client/Api/HouseManagementApi.cs

@@ -70,6 +70,18 @@ namespace Hcs.Client.Api
             return await request.ExecuteAsync(payload, token);
         }
 
+        /// <summary>
+        /// Импорт сведений о ДУ (создание ДУ)
+        /// </summary>
+        /// <param name="payload">Пейлоад ДУ</param>
+        /// <param name="token">Токен отмены</param>
+        /// <returns>Импортированный договор</returns>
+        public async Task<importContractResultType> ImportContractDataAsync(ImportContractDataPayload payload, CancellationToken token = default)
+        {
+            var request = new ImportContractDataRequest(client);
+            return await request.ExecuteAsync(payload, token);
+        }
+
         /// <summary>
         /// Импорт данных дома
         /// </summary>