adapter readme

Author: T0shik

README.md

@@ -7,4 +7,5 @@ Full Playlist can be found [here](https://www.youtube.com/playlist?list=PLOeFnOV
 - [Factory, Abstract Factory, Factory Method](https://youtu.be/xN7EFHU_rXA)
 - [Builder](https://youtu.be/WfBsYo20D_I)
 - [Prototype](https://youtu.be/fqaoCDyxb1w)
-- [Singleton](https://youtu.be/9_9hI69fwhg)
+- [Singleton](https://youtu.be/9_9hI69fwhg)
+- [Adapter](https://youtu.be/9ZFN8DrvcYA)