Update 'README.md'

README.md

@@ -48,6 +48,7 @@ ___
 - [Pfaffian](https://en.wikipedia.org/wiki/Pfaffian)
 - [Peppermint vs. Spearmint](https://www.masterclass.com/articles/spearmint-vs-peppermint-explained)
 - [Carathéodory's theorem (convex hull)](https://en.wikipedia.org/wiki/Carath%C3%A9odory%27s_theorem_(convex_hull))
+- [Clydesdale](https://en.wikipedia.org/wiki/Clydesdale_horse)
 
  
 ## [Mathematics and Theoretical Computer Science](mathematics.md)