added readme
added first challenge (entry)

http://www.codewars.com/dojo/katas/50654ddff44f800200000001
added second challenge (entry)

http://www.codewars.com/dojo/katas/50654ddff44f800200000004
added challenge

http://www.codewars.com/dojo/katas/52aeb2f3ad0e952f560005d3