remove RPS from exercises
add a basic stubbing example
Added test cases for ex0 and implemented method
Wrote test cases for ex1 and ex2 as well as implemented the methods
Added test cases for ex3 and also implemented method
Added test cases for ex4 and implemented method
Added test cases for ex5 which tests for puts statement and implemented method
Added test cases for ex6 which updates last item in array. Also implemented method
Added test cases for exercise 7 and implemented method
Finished test cases for ex8 and implemented method
Added test cases for leap year method and implemented method
Changed from puts to print in exercise 8
Finished exercise 10 using Jimmy's solution
Finished test cases for extension exercise as well as implemented the method