adding a file about_strings.js to work with strings exercise
adding results to test delimeters and test concatenation
adding character type string to the given function
adding Apple as an answer to the given function escape
adding 5 which is the length for the given string
adding apple which is the result for the slised string
adding about_numbers.js to work with numbers exercise
adding true because ints and floats are of the same type
adding number since the numeric javascript type for integer is number
adding 1 because it is an integer number equivalent to 1.0
adding true for the given condition
adding false since 'is Nan' not equal to 'NaN'
adding about_objects.js to work with exercise for objects