Added some testing and debugging challenges
Added some testing and debugging challenges

raisedadead/FreeCodeCamp,jonathanihm/freeCodeCamp,BhaveshSGupta/FreeCodeCamp,raisedadead/FreeCodeCamp,FreeCodeCamp/FreeCodeCamp,BhaveshSGupta/FreeCodeCamp,otavioarc/freeCodeCamp,HKuz/FreeCodeCamp,pahosler/freecodecamp,pahosler/freecodecamp,jonathanihm/freeCodeCamp,FreeCodeCamp/FreeCodeCamp,otavioarc/freeCodeCamp,BhaveshSGupta/FreeCodeCamp,HKuz/FreeCodeCamp