Update README.md

Author: jcs090218

README.md

@@ -1,3 +1,9 @@
+<picture>
+  <source media="(prefers-color-scheme: light)" srcset="https://raw.githubusercontent.com/jcs-emacs/jcs-elpa/master/docs/etc/sink/black.png">
+  <source media="(prefers-color-scheme: dark)" srcset="https://raw.githubusercontent.com/jcs-emacs/jcs-elpa/master/docs/etc/sink/white.png">
+  <img width="25%" align="right" src="">
+</picture>
+
 [![License: CC BY-NC-ND 4.0](https://img.shields.io/badge/License-CC_BY--NC--ND_4.0-lightgrey.svg)](https://creativecommons.org/licenses/by-nc-nd/4.0/)
 
 # jcs-emacs.github.io