Add filetype to results of the bing custom search
When getting back results from the Bing Custom Search it would be useful to get the filetype of the returning WebPage Object. Currently there are only the field available mentioned in https://docs.microsoft.com/de-de/rest/api/cognitiveservices/bing-custom-search-api-v7-reference#webpage.
I would suggest to add another property "filetype" or "mimetype" which contains the filetype of the resource (e.g. pdf, pptx, xls or similar).