docs: Add SVG compatibility note (#1830)

Co-authored-by: Aaron <aaronklinker1@gmail.com>

Author: typed-sigterm

packages/auto-icons/README.md

@@ -6,6 +6,7 @@
 
 - Generate extension icons with the correct sizes
 - Make the icon greyscale or include a visible overlay during development
+- SVG is supported
 
 ## Usage