Write a function that receives a string. It should return True if the string begins with the letter 'x' (lowercase or capital).
Examples:
startsWithX("x-men") returns TruestartsWithX("X-Men") returns TruestartsWithX("The Incredible X-Men") returns FalsestartsWithX("") returns FalsestartsWithX("xOxOx") returns True©2017 Graham Mitchell