App Request: nicebucket

### Is this a new request?

- [x] I have checked that this app does not already have a pending request and has not previously been declined.

### App Name

nicebucket

### Download URL

https://github.com/nicebucket-org/nicebucket/releases

### Website URL

https://github.com/nicebucket-org/nicebucket

### App Summary

 A fast, private, open-source S3 GUI. 