Add link to small database of questions

Author: thatguyintech

README.md

@@ -2,6 +2,9 @@
 
 My medium post explaining the challenge: https://medium.com/@alberthu/my-100-day-coding-challenge-1cfc0985b1e5
 
+A nice database of some common data structure and algorithms questions:
+https://techiedelight.quora.com/500-Data-Structures-and-Algorithms-practice-problems-and-their-solutions?share=8f826f10&srid=nr7l
+
 100 days, 100 computer science interview questions. The questions can range from topics that I'm good at,
 topics that I know nothing about, different websites like leetcode, geeksforgeeks,
 interviewcake, codefights, or different Facebook groups I'm a part of. I'll