Created README

Author: matakshay

README.md

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+# Data Structures
+<p align="justify">
+This is a collection of some complex data structures which have been implemented in C++ using OOP. Currently the following data structures have been included -
+</p>
+<ul>
+  <li> Binary Search Tree (BST) - https://en.wikipedia.org/wiki/Binary_search_tree </li> 
+  <li> Adelson-Velsky and Landis (AVL) Tree - https://en.wikipedia.org/wiki/AVL_tree </li>
+  <li> Trie (also known as Prefix Tree) - https://en.wikipedia.org/wiki/Trie </li>
+</ul>