Merge pull request #1197 from switchhax/master

Created 'problem-sets-en.md'    for reference: #1191

problem-sets-competitive-programming.md

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+### Index
+* [Competitive Programming](#competitive-programming)
+* [Problem Sets] (#problem-sets)
+
+
+### Competitive Programming
+* [4Clojure](http://www.4clojure.com/)
+* [Codeabbey](http://www.codeabbey.com/)
+* [Codechef](http://www.codechef.com/contests)
+* [Codeeval](https://www.codeeval.com/)
+* [Codeforces](http://codeforces.com/)
+* [Coderbyte](http://coderbyte.com/)
+* [Codingame](http://www.codingame.com/start)
+* [Facebook Hackercup](https://www.facebook.com/hackercup)
+* [Hackerrank](https://www.hackerrank.com/)
+* [Hello World Open](https://helloworldopen.com/)
+* [Internet Problem Solving Contest](http://ipsc.ksp.sk/)
+* [Just another Golf Coding](http://jagc.org/)
+* [Topcoder](https://www.topcoder.com/)
+
+
+### Problem Sets
+* [Anarchy Golf](http://golf.shinh.org/)
+* [Caribbean Online Judge](http://coj.uci.cu/24h/problems.xhtm)
+* [CheckIO](http://www.checkio.org/)
+* [Coding Bat](http://codingbat.com/java)
+* [Google Code Jam - Practise](https://code.google.com/codejam/contests.html)
+* [Hacker.org](http://www.hacker.org/)
+* [Mathproblem of the Month - Bilkent University](http://www.fen.bilkent.edu.tr/~cvmath/prob-month.html)
+* [PKU Online Judge](http://poj.org/)
+* [Ponder This!](http://domino.research.ibm.com/Comm/wwwr_ponder.nsf/pages/index.html)
+* [Project Euler](https://projecteuler.net/)
+* [Sphere Online Judge](http://www.spoj.com/)
+* [Timus Online Judge](http://acm.timus.ru/)
+* [UVa Online Judge](http://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8)