message: Added useful resources for cp and interview prep
diff: * [Codewars](https://www.codewars.com/)
  * [freeCodeCamp](https://www.freecodecamp.org/learn/)
  * [AtCoder](https://atcoder.jp/)
  +* [Spoj](https://www.spoj.com/problems/classical/)
  [GeeksForGeeks](https://www.geeksforgeeks.org/) - Best place to find detailed notes on theoretical subjects including Database Management System, Data Structures, Data Algorithms, Object Oriented Programming, Operating Systems and many more.An all rounder website for placement preparation having company wise coding questions and MCQs.
  [CareerCup](https://www.careercup.com/) - Good source for software engineering interview preparation.
  +[LeetCode](https://leetcode.com/) - A great platform to practice questions, mock interviews for interviews from product based companies.
  +
  +[Spoj](https://www.spoj.com/problems/classical/) - Good source for practiv=cing quality problems for competitive programming cum algorithms.
  +
  ### Tutorials to improve Competitive Programming:
  * [TopCoder Competitive Programming Tutorials](https://www.topcoder.com/community/competitive-programming/tutorials/) - A list of best tutorials written by respected Topcoder members.
  [Crack_the_coding_interview](https://github.com/alxerg/Books-1/blob/master/Cracking%20the%20Coding%20Interview%2C%206th%20Edition%20189%20Programming%20Questions%20and%20Solutions.pdf) An important book to up your interview skills
  +[Narasimha Karumanchi - Data structures and algorithms made easy](https://github.com/MethkupalliVasanth/Books/blob/master/Narasimha%20Karumanchi%20-%20Data%20structures%20and%20algorithms%20made%20easy%20(0%2C%20CareerMonk).pdf) An important book to learn must needed algorithms for interviews
  +
  