update: entry in README

Author: ashokdey

README.md

@@ -40,6 +40,7 @@ Collection of interview questions with Unit Tests. Problems includes Data Struct
   - [Binary Search Tree](src/_DataStructures_/Trees/BinarySearchTree)
     - [Find k<sup>th</sup> maximum in a BinarySearchTree](src/_DataStructures_/Trees/BinarySearchTree/find-kth-max)
     - [Find k<sup>th</sup> minimum in a BinarySearchTree](src/_DataStructures_/Trees/BinarySearchTree/find-kth-min)
+    - [Find Ancestors of a Node](src/_DataStructures_/Trees/BinarySearchTree/find-ancestors)
   - [Suffix Tree](src/_DataStructures_/SuffixTree)
 
 ### Logical Problems