Add YT link

Author: andrei-punko

src/main/java/by/andd3dfx/collections/SimplifyPath.java

@@ -55,6 +55,8 @@
  * Explanation:
  * "..." is a valid name for a directory in this problem.
  * </pre>
+ *
+ * @see <a href="https://youtu.be/ZONpIPMSNPk">Video solution</a>
  */
 public class SimplifyPath {