Nice to have feature: Exif data in saved files

[morgan-wild]

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Firstly, thank you so much for your library!

I'm using it to take and store pictures to an SD card, with the date & time as name. But I'm not able to change the "create date" property in the exif data of these pictures which is wrong.

Exif data are very useful for many reasons (order in an album like the Google Drive for example).

Maybe a new and optional parameter could be added to use sdmmc.save(path, exif) ?

Thank you again :)