Adding Plain Readmes

readmes/challenges

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+# Awesome Challenges
+
+A curated list of algorithmic challenges websites.
+
+- [Advent of Code](https://adventofcode.com)
+- [CareerCup](https://www.careercup.com/page)
+- [CheckiO](http://www.checkio.org/)
+- [CodeCombat](https://codecombat.com/)
+- [CodeFights](https://codefights.com/)
+- [Codeforces](https://codeforces.com/)
+- [CodeHunt](https://www.codehunt.com/)
+- [Codewars](http://www.codewars.com/)
+- [Codility](https://codility.com/programmers/challenges/)
+- [Coding Mystery](https://codingmystery.com/)
+- [CodinGame](https://www.codingame.com/start)
+- [CSSBattle](https://cssbattle.dev/)
+- [exercism.io](http://exercism.io/)
+- [Free Code Camp](https://www.freecodecamp.com/)
+- [HackerRank](https://www.hackerrank.com/)
+- [Interview Cake](https://interviewcake.com/)
+- [InterviewBit](https://www.interviewbit.com/)
+- [Kattis](https://open.kattis.com/)
+- [LeetCode](https://leetcode.com/)
+- [Project Euler](https://projecteuler.net/)
+- [ROSALIND](http://rosalind.info/)
+- [Screeps](https://screeps.com/)
+- [smarterer](http://smarterer.com/tests/categories/Programming)
+- [SoloLearn](https://sololearn.com)
+- [TheHuxley](https://www.thehuxley.com/)
+- [topcoder](https://www.topcoder.com/challenges/)
+- [URI Online Judge](https://www.urionlinejudge.com.br/judge/en/login)
+
+## License
+
+Based on [bayadin/awesome-awesomeness](https://github.com/bayandin/awesome-awesomeness) repository.
+
+[![Creative Commons License](http://i.creativecommons.org/l/by/4.0/88x31.png)](http://creativecommons.org/licenses/by/4.0/)
+
+This work is licensed under a [Creative Commons Attribution 4.0 International License](http://creativecommons.org/licenses/by/4.0/).