Provide an Application icon

[elbenfreund]

We should provide an Icon to be shown in the GNOME app menu

Resources:

• https://wiki.gnome.org/HowDoI/ThemedIcons

[jtojnar]

According to the Icon Theme Specification, we should place a PNG file into $prefix/share/icons/hicolor/48x48/apps and preferably also a SVG to $prefix/share/icons/hicolor/48x48/apps. And the link from OP also suggest placing monochrome SVG icon with -symbolic suffix to $prefix/share/icons/hicolor/symbolic/apps. The icon name should be the same as the executable name plus an extension.

Do we re-use the icon from the old hamster app or try to find an artist to give it a slight refresh or even come up with something new?