[Feature request] Option to delete duplicate files

[inson1]

Checklist

• [x] I made sure that there are no existing issues - open or closed - to which I could contribute my information.
• [x] I have read the FAQ and my problem isn't listed.
• [x] I have taken the time to fill in all the required details. I understand that the feature request will be dismissed otherwise.
• [x] This issue contains only one feature request.
• [x] I have read and understood the contribution guidelines.

Is your feature request related to a problem? Please describe. I have lots of duplicate files on my phone.

Describe the solution you'd like Option to delete duplicate files. But it would be also great to show list of them before deleting. So you dont loose something, if there is bug.

[inson1]

https://github.com/SimpleMobileTools/Simple-File-Manager/issues/771