Background image implementation request

[MoonDragon-MD]

Hi I tried your extension on Ubuntu 20.04 (Gnome 3.36.9) and it works very well, thanks for your work!

I would like to know if it is possible to add the possibility to put as background of the note an image, and that the icons for editing appear only when you move the mouse over!

An example, but you have to consider the transparency that I didn't put in: