Create coding-competitons.md

Author: Vyomaan

coding-competitions.md

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+Competitons to participate in when you are bored, or just want to code!
+
+- [Code Chef](https://www.codechef.com/)
+- [HackerEarth](https://www.hackerearth.com/challenges/)
+- [Top Coder](https://www.topcoder.com/)
+- [Google Code Jam](https://code.google.com/codejam/)
+- [CoderByte](https://www.coderbyte.com/)
+- [Project Euler](https://projecteuler.net/)
+- [Excercism.io](https://exercism.io/)
+- [CodeWars](https://www.codewars.com/)
+- [Rosalind](http://rosalind.info/)