Feature request: Add spotify logo

[mindctrlSE]

Hey!
I really like this extension and I thought it would look nice to add the spotify icon on the left side of the spotify info, making it look something like this:

I would also be great if you could tweak the size and color of the icon. To my understanding there is two ways to approach this. First create the a class in stylesheet.css with the icon size and color. Then either: (1) use a icon font (e.g., FontAwesome or IcoFont) which includes the spotify icon. Or (2) use a .svg file of the icon.

From here I am completely lost how to apply this to code. I have tried to look through the to the extension.js but my knowledge in java script is scarce.

I am very grateful for any suggestions or documentation that could help me to create this. Thanks in advance.