Update README.md

Author: jcs090218

README.md

@@ -2,6 +2,12 @@
 [![JCS-ELPA](https://raw.githubusercontent.com/jcs-emacs/badges/master/elpa/v/jcs-screensaver.svg)](https://jcs-emacs.github.io/jcs-elpa/#/jcs-screensaver)
 <a href="https://jcs-emacs.github.io/"><img align="right" src="https://raw.githubusercontent.com/jcs-emacs/badges/master/others/built-with/dark.svg" alt="Built with"></a>
 
+<picture>
+  <source media="(prefers-color-scheme: light)" srcset="https://raw.githubusercontent.com/jcs-emacs/jcs-elpa/master/docs/etc/logo/light/sink.png">
+  <source media="(prefers-color-scheme: dark)" srcset="https://raw.githubusercontent.com/jcs-emacs/jcs-elpa/master/docs/etc/logo/dark/sink.png">
+  <img width="20%" align="right" src="">
+</picture>
+
 # jcs-screensaver
 > A screensaver for `jcs-emacs`