Option to show notification when user copies content

[brunnobb]

I do not set Clipped to start automatically or sometimes I can kill it for many reasons. Then I try to use it and realize it was not open and not saving the content of my clipboard.

Would be very useful to have a notification when data is copied to the clipboard. The user can always mute them, or disable this feature. I made the code and submitted a PR in case you think its a nice feature