fix: update with copyright and license information

Signed-off-by: Fredrik Nordlander <fredrik.nordlander@digg.se>

Author: fredriknordlander

REUSE.toml

@@ -28,6 +28,7 @@ path = [
     "images/dok15_2.png",
     "images/dok17-2.png",
     "images/dok17.png",
+    "images/dok18.png",
     "images/dok19.png",
     "images/dok20.png",
     "images/dok3.png",