docs: add preview image

Author: nik-rev

docs/README.md

@@ -1,5 +1,7 @@
 # patchy
 
+![image](https://github.com/user-attachments/assets/95546bae-5f61-4a14-b849-c4805bbe27af)
+
 `patchy` makes it easy to maintain personal forks in which you merge some pull requests of your liking to have more features than other people.
 
 - [Why should I use it?](#why-should-i-use-it)