Add python-ds

Author: prabhupant

README.md

@@ -123,6 +123,7 @@ Inspired by [awesome-php](https://github.com/ziadoz/awesome-php).
 * [PyPattyrn](https://github.com/tylerlaberge/PyPattyrn) - A simple yet effective library for implementing common design patterns.
 * [python-patterns](https://github.com/faif/python-patterns) - A collection of design patterns in Python.
 * [sortedcontainers](https://github.com/grantjenks/python-sortedcontainers) - Fast, pure-Python implementation of SortedList, SortedDict, and SortedSet types.
+* [python-ds](https://github.com/prabhupant/python-ds) - Clean and simple collection of data structure and algorithms in Python for coding interviews.
 
 ## ASGI Servers