Write a small app for Bitrix24, box

There are a lot of folders with names in the format of "text"123456. You want to write an application in which there should be a field to enter, there the user enters through a comma number, these numbers are the second part of the name of folders, numbers can be as many as you want, can be one. The user then clicks the "Download" button, and the folders, in the second part of the name of which there is data numbers, are downloaded to the users PC archive. There should also be a small report, you can directly in the application by text, which folders are found and downloaded, and which in principle was not. Please write the indicative terms and price