added documentation

Author: UmiKami

exercises/153-isRotated/README.es.md

@@ -12,3 +12,4 @@ Una rotación en una cadena se define como quitar el primer elemento y concatena
 let output = isRotated("Hello World", "orldHello W")
 console.log(output) // true
 ```
+> Más informacion acerca de la rotación de cadenas: [click aquí](https://www.techiedelight.com/es/find-lexicographically-minimal-string-rotation/)

exercises/153-isRotated/README.md

@@ -12,3 +12,5 @@ A rotation on a string is defined as removing first element and concatenating it
 let output = isRotated("Hello World", "orldHello W")
 console.log(output) // true
 ```
+
+> For better understanding of string rotation check this article: [click me](https://javarevisited.blogspot.com/2017/07/2-ways-to-check-if-one-string-is-rotation-of-another-String.html#axzz7tVz1WCRT)